Sodium metal (Na) has properties with lithium metal (Li) because the two metals are located in the same group, namely group IA.
What are the physical and chemical properties of group IA?All elements in group IA are included in the alkali metals, except hydrogen, because the character possessed by hydrogen is "different" and does not match the character of other alkali metals.
Physically properties, all alkali metals are shiny white (silver), except for cesium which is golden yellow. The texture of this metal tends to be soft. If we try to burn this metal, the resulting flame will be different, namely lithium (red), sodium (yellow), potassium (purple), rubidium (red), and cesium (blue).Chemical properties, alkali metals are the most reactive metal group. That is, the more reactive a metal is, the easier it is to lose electrons. In addition, if we order from top to bottom on the periodic table, the electronegativity, ionization energy, melting point, and boiling point properties will be smaller.Learn more about alkali metals here https://brainly.com/question/19109836
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in the next three problems, we will attempt to solve the problem: what is the standard entropy change for the combustion of 1 mole of diamond at room temperature?
The standard entropy change for the combustion of 1 mole of diamond at room temperature is 6.22 J / K mol.
The reaction is given as :
C (diamond) + O₂ -----> CO₂
At room temperature the value of S° is given as follows :
C = 2.38 J / K mol
O₂ = 205.2 J/Kmol
CO₂ = 213.8 J/Kmol
The standard entropy change is given as :
ΔS° = ∑S° product - ∑ S° reactant
ΔS° = ( 213.8 ) - ( 2.38 + 205.2)
ΔS° = 213.8 - 207.58
ΔS° = 6.22 J / K mol
Thus, The standard entropy change for the combustion of 1 mole of diamond at room temperature is 6.22 J / K mol.
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when a platinum wire is dipped into a strontium nitrate solution and then inserted into a burner flame, the strontium atoms emit a characteristic red color. this is an example of how an element can be identified by its unique
A platinum wire is dipped into a strontium nitrate solution. Then inserted into a burner flame, then the strontium atoms emit a characteristic red color. this is an example of how an element can be identified by its unique atomic emission spectrum.
What is atomic emission spectrum?The goal of an atom's electron arrangement is to keep the energy of the atom as low as feasible. An atom's ground state has the lowest energy level of all the atoms. When the energy is applied to those atoms, the electrons take it in and go to a higher energy level. The electrons in atoms have quantized energy levels, which again means that they must transition from one level to another in discrete increments rather than constantly. An atom is said to be in an excited state when its potential energy exceeds that of the ground state. An excited atom is not a stable atom.
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Can yall help me with this
Answer:
A planetary scientist who works at john hopskin university
Explanation:
a noble gas has a density of 1.78 g/l at stp. what is the identity of the gas? enter the elemental symbol of the gas.
The gas after the calculation has a molar mass of 39.95g/mol which is that of Argon. The elemental symbol of gas is Ar.
We know that 1 mol of gas has 22.4L of any gas at STP.
Given in the question is the density of the gas 1.78g/l at STP.
Hence the mass of 22.4 L of the elemental gas at STP is its molar mass.
Hence molar mass
=22.4 l/mol × 1.7824 g/L
= 39.925g/mol
These gases are called noble gases because they are majestic in nature, which means they dont react with anything in general.
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what can you deduce about the conformation of the polystyrene chains under the conditions of the visocity determinations
Viscosity of polystyrene is determined to know the size of polystyrene its compression, and molding capacity.
To obtain the perfect shape and size the configuration of polystyrene should be maintained under different conditions.
So, to deduce the confirmation of the polystyrene under viscosity determination we can apply 2 methods;
1. By adding excess diluents to the polystyrene which reduces its viscosity.
2. By introducing or adding small linear chains by addition method to the molecular chains of polystyrene molecular structure to reduce chain entanglement.
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what absorbance did you record for spinach at 400 nm?6.25 points question 2what absorbance did you record for spinach at 420 nm?6.25 points question 3what absorbance did you record for spinach at 440 nm?
It was discovered that the photosynthetic pigment in spinach best absorbed light between the wavelengths of 400 and 450 nm as well as at 650 nm. Additionally, it was discovered that this green phototroph barely absorbed light at wavelengths about 550 nm.
What is Absorbance ?The logarithm of the ratio of incident to transmitted radiant power through a sample is known as absorbance. As an alternative, absorbance can be defined as "the negative logarithm of one minus absorptance, as measured on a homogeneous sample," for samples that scatter light.
The opposite of transmittance, or absorbance (A), indicates how much light the sample absorbed. Additionally known as "optical density." A logarithmic function of T is used to compute absorbance: A = log10 (1/T) = log10 (Io/I).The concentration of the molecule (C) and the sample's path length (L), which is typically equal to the cuvette's path length, combined make up the three factors that affect an absorbance value. The extinction coefficient () is the next factor.What is the absorbance of Spinach ?The disks will rise as a result of bubbles developing on their surface when the leaves create oxygen. The leaves eventually sink if the cup's light source is taken away.
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How can science help places that are affected by natural disasters?
Answer:
The answer is sophisticated earthquake early-warning systems, increasingly accurate storm forecasting, and innovative flood risk and flood mitigation projects provide communities with the tools they need to respond to impending hazard events, and infrastructure design and engineering improvements help to reduce the damage suffered
Explanation:
I hope this helps
The residents asked the town planners to propose some possible solutions that will address their transportation concerns and reduce the amount of CO2 released into the atmosphere. Of these, which is your favorite solution:
Question 3 options:
Restrict the use of private vehicles powered by fossil fuels on public roads.
Promote vehicles powered by renewable energy sources to harvest the crops and get them to market.
The solution for addressing transportation concerns and reducing the amount of carbon dioxide released into the atmosphere might include promoting vehicles powered by renewable energy sources to harvest the crops and get them to market (Option B).
What are renewable energy sources?The expression renewable energy sources make reference to different types of energy that replace the use of fossil based fuels in order to avoid the increase in the carbon dioxide level.
Therefore, with this data, we can see that renewable energy sources such as wind energy or solar energy replace fossil based fuels.
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Exam Question: Describe and
explain the trends in melting and
boiling points across period 3
As we move across period 3 the number of delocalized electrons per metal atom increases and the radius of the elements decreases. This means the melting point increases.
What is melting point and boiling point ?
The temperature at which molecules in a solid can pass one another and transform into liquids is known as the melting point. On the other hand, liquids and gases are involved in the boiling point. Some molecules at the liquid's surface are escaping as the molecules move around.
The three metals' melting and boiling points rise as a result of the strengthening of their metallic connections. Each atom can contribute an increasing quantity of electrons to the delocalized "sea of electrons." As you get from sodium to magnesium to aluminum, the atoms also get smaller and have more protons.
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would you expect the dissolved oxygen levels in water sampled from a stream entering a lake to be higher or lower than the dissolved oxygen levels in water sampled from the lake itself? explain why.
I would expect the dissolved oxygen levels from wаter entering а lаke to hаve lower thаn the lаke itself becаuse the steаm is аble to hаve wаrm wаter which cаn cаuse the lаke temperаture to be wаrm аlso. Hаving wаrm wаter meаns hаving less dissolved oxygen.
What is the dissolved oxygen level?Dissolved oxygen (DO) is the аmount of oxygen thаt is present in wаter. Wаter bodies receive oxygen from the аtmosphere аnd from аquаtic plаnts. Running wаter, such аs thаt of а swift moving streаm, dissolves more oxygen thаn the still wаter of а pond or lаke. Heаlthy wаter should generаlly hаve dissolved oxygen concentrаtions аbove 6.5-8 mg/L аnd dissolved oxygen sаturаtion between аbout 80-120%.
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a gas cylinder has a volume of 108 L when filled with 22,700 grams of nitrogen gas if the temperature of this cylinder is 27 degrees what is the pressure inside the tank?
P=183.65 atm is the pressure inside the tank for the given conditions.
How is the pressure calculated?
Given,
V=108 L
m=22700 gm
The formula is PV=nRT
moles= [tex]\frac{Mass}{Molar mass}[/tex]
∴moles of [tex]N_{2}[/tex] = [tex]\frac{22700}{28}[/tex]=810.78 moles.
R=0.082 [tex]\frac{L atm}{molK}[/tex]
T=27°C=300K
P=[tex]\frac{nRT}{V}[/tex]
[tex]P_{N_{2}[/tex]=[tex]\frac{810.71 X 0.0821 X 298}{108}[/tex]
P=183.65 atm
The ideal gas law (PV = nRT) connects the macroscopic characteristics of ideal gases. A gas is considered to be perfect if its particles (a) do not interact with one another and (b) occupy no space (have no volume).
PV = nRT
PV = nRT is the equation for an ideal gas. In this equation, P stands for the ideal gas's pressure, V for the ideal gas' volume, n for the total amount of the ideal gas expressed in moles, R for the universal gas constant, and T for temperature.
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how do acids and bases interact with water? how does this interaction be different for strong acids and weak acids?
Acid and Bases interact in water as they form Hydronium ion and hydroxide ions. The interaction for strong acids and weak acids produces salts.
Acid are those which have ability to dissociates into H⁺ ions. ans the bases are those which have ability to produce OH⁻ ions. when we mix acid with water it produce hydronium ions.
HCl + H₂O -----> H₃O⁺ + Cl⁻
when we mix base with water it produced hydroxide ions.
NaOH + H₂O ------> Na⁺ + OH⁻
The mixture of two acids of different will react together. while when two acids mix the reaction do not happen. when we mix weak acid with the strong acid it produces salt because weak acid have higher pH which is basic.
Thus, Acid and Bases interact in water as they form Hydronium ion and hydroxide ions. The interaction for strong acids and weak acids produces salts.
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a 625- ml sample of unknown hcl solution reacts completely with na2co3 to form 17.1 g co2 . what was the concentration of the hcl solution?
According to the given statement 1.24 M was the concentration of the hcl solution.
What is the HCI solution?One of the main tools for connecting, managing, and running networked enterprise applications in a failover clustering infrastructure is a hyper - converged architecture (HCI) solution (HCI). Organizations may virtualize data, servers, and networks thanks to technology.
Briefing:The balanced reaction is 2 HCl + Na₂CO₃ ==> CO₂ + H₂O + 2 NaCl
This shows that each mole of CO₂ created results in
There are two moles of HCl needed. So, starting with the atomic weights of carbon and oxygen, let's determine how many moles of CO₂ were produced.
Atomic weight carbon = 12.0107
Atomic weight oxygen = 15.999
Molar mass CO₂
= 12.0107 + 2 * 15.999
= 44.0087 g/mol
Moles CO₂ = 15.1 g / 44.0087 g/mol = 0.388559535 moles
We know we needed twice as much HCl based on the balanced equation,
so 0.388559535 mol * 2 = 0.77711907 mol
Simply divide the amount of moles by the number of liters because molarity is defined as moles per liter,
so: 0.77711907 mol / 0.625 l = 1.24339051 mol/l
Since our data only has three significant figures, round it to three figures to get 1.24 m.
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Compare the structure and bonding of three compounds
Carbon dioxide, magnesium oxide, silicon dioxide
A solid with a covalent network is silicon dioxide. Carbon dioxide is a covalent molecule, whereas magnesium oxide is an ionic substance.
It is a covalent molecule, carbon dioxide. Although the complex has polar C-O bonds, it is often nonpolar, therefore the molecules are only held together by modest dispersion forces.
Ionic solids include the substance magnesium oxide. It has a crystal lattice made up of magnesium ions and oxygen ions. The chemical is almost insoluble in water because of the significant lattice energy and small ion sizes.
Chains of silicon-oxygen bonds make up the covalent network solid known as silicon dioxide. The network solid has a high melting point and creates a very stiff structure.
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How do you find Mass number
Answer:
Together, the number of protons and the number of neutrons determine an element’s mass number: mass number = protons + neutrons. If you want to calculate how many neutrons an atom has, you can simply subtract the number of protons, or atomic number, from the mass number. A property closely related to an atom’s mass number is its atomic mass.
Explanation:
what single qualitative test from this module could be employed to distinguish between t-butyl chloride and n-butyl chloride? state which compound would come out positive and what would be the indicatio
T-butyl chloride changes its ppt formed and color more quickly with ague and an indicator than other chlorides do.
The hydrant A color shift was caused by the addition of AgNO3 when a product like Hl reacted with the acid-base indicator MethyL red. The released chloride ion was found by Agel precipitation at ambient temperature. Both a color change in an indicator and a precipitate format positively confirmed that the reactivity order in both cases is t-butyl chloride > n-butyl chloride. As a result, t-butyl chloride changes its ppt formed and color more quickly with ague and an indicator than other chlorides do.
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There are many theories about how life was formed on Earth.
Suggest one reason why there are many
question unless otherwise instructed, you may use the periodic table in the chemistry: problems and solutions book for this question. which element is most likely the best conductor of heat?
Silver is most likely the best conductor of heat according to the periodic table.
The most electrically conductive component is silver, taken after by copper and gold. Silver too has the most elevated warm conductivity of any component and the most noteworthy light reflectance.
The components can be classified as metals, nonmetals, or metalloids. The most electrically conductive component is silver, taken after by copper and gold. Silver too has the most elevated warm conductivity of any component and the most noteworthy light reflectance.
As to why silver is the most excellent conductor, the reply is that its electrons are more liberated to move than those of the other components.
This has got to do with its valence and gem structure. Most metals conduct power. Other components with tall electrical conductivity, are aluminum, zinc, nickel, press, and platinum. Brass and bronze are electrically conductive amalgams, instead of components.
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Which group is outside of our solar system
Answer:
Exoplanets
Explanation:
Exoplanets are planets beyond our own solar system. Thousands have been discovered in the past two decades, mostly with NASA's Kepler Space Telescope.
why are the first ionization energy of the transition elements from sc to zn fairly constant until zn?
Due to same d-same shell, that's why first ionization energy of the transition elements .
What is ionization energy?Ionization energy, also called ionization potential, in chemistry and physics, the amount of energy required to remove an electron from an isolated atom or molecule.
What is transition elements?Transition elements (also known as transition metals) are elements that have partially filled d orbitals. IUPAC defines transition elements as an element having a d subshell that is partially filled with electrons, or an element that has the ability to form stable cations with an incompletely filled d orbital.
Why first ionization energy of the transition elements is constant?In transition elements, the first ionization energy of the elements remain constant because of poor shielding in d-subshell. The electrons suffers repulsion due to which their ionic radii does not decrease on moving from left to right. That's why first ionization energy of the transition elements from Sc to Zn fairly constant until Zn.
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select all that apply select all the statements that correctly describe steps in the procedure used to identify a limiting reactant. multiple select question. the maximum product possible is given by the sum of the amounts of product formed from each reactant. the reactant that produces the least amount of possible product is the limiting reactant. the reactant that has the highest mass at the beginning of the reaction is in excess. calculate the molar masses of any reactants for which a mass has been given. calculate the amount of product that could be formed from each reactant.
Step 1: Begin with a balanced chemical equation and starting amounts for each reactant.
Step 2: Convert mass of each starting reactants to moles.
Step 3: Calculate the number of moles used for each reactant. is the limiting reagent.
what is limiting reaction?
The limiting reactant (or limiting reagent) is the reactant that gets consumed first in a chemical reaction and therefore limits how much product can be formed.The reactant that is entirely used up in a reaction is called limiting reagent. In the reaction given above, 3 moles of Hydrogen gas are required to react with 1 mole of nitrogen gas to form 2 moles of ammonia.Determine which reactant is limiting by dividing the number of moles of each reactant by its stoichiometric coefficient in the balanced chemical equation. Use mole ratios to calculate the number of moles of product that can be formed from the limiting reactant.In a chemical reaction, reactants that are not used up when the reaction is finished are called excess reagents. The reagent that is completely used up or reacted is called the limiting reagent, because its quantity limits the amount of products formed.to know more about limiting reaction follow
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How many moles are equal to 4.0 x 10^25 atoms of tungsten
Explanation:
the answer was already on here
Which of the electron dot structures correctly illustrates diatomic nitrogen with a triple bond?.
The electron dot structure of diatomic nitrogen is N≡N.
The electron dot structure of the nitrogen molecule is attached
The atomic number = 7
Chemical symbol = N
Type of bond = Triple bond
Group = 5A
Total number of valance electrons = 5
Lewis structure:
Find the total number of valence electrons Find the number of electronsNumber of bonds in the moleculesChoosing the central atom with the highest electronegativity.Drawing the base skeletal structure.Placing the electrons as per the octet rule around the outer and central atoms.Therefore the electron dot structure is N≡N.
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2. 2.00 gram of a compound requires the following quantities of solvent to dissolve: 90.0 ml of water, 7.50 ml of chloroform, 32.0 ml of diethyl ether, or 85.0 ml of benzene. calculate the partition coefficient of the compound between chloroform and water, diethyl ether and water, and benzene and water. which solvent would you choose to extract the compound from an aqueous solution?
Partition coefficient Chloroform = 11.98, Diethyl Ether = 2.81 and Benzene = 1.05
Chloroform would be the ideal solvent to use when extracting the chemical from an aqueous solution because it has the highest solubility.
A solution is a homogenous mixture of one or even more solutes in a solvent. Adding sugar cubes to a cup of tea or coffee is an example of a solution. A property that facilitates the dissolution of sugar molecules is solubility. Solubility is the property of a substance (solute) to dissolve in a particular solvent. A solute is any solid, liquid, or gaseous substance that dissolves in a solvent.
The compound needs 2 grams of solvent to dissolve it.
Finding solubility
For water, 2g/90ml= 2.22
For chloroform, 2g/7.50= 26.6
For diethyl ether, 2g/32= 6.25
For benzene, 2g/85= 2.35
Partition Coefficients -
For chloroform = 11.98
For Diethyl Ether = 2.81
For Benzene = 1.05
As a result of its high solubility, chloroform would be used to extract a compound from an aqueous solution.
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write the reaction equation for the strong acid titration. you can use generic formula ha for the monoprotic strong acid.
The molarity of the acid is given, so the number of moles titrated can be calculated: 0.050 L × 6 mol/L = 0.3 moles of strong acid added thus ...
How do you write a titration equation?A strong acid-strong base titration is used to determine the concentration of an acidic solution by titrating it with a known concentration of a basic solution, or vice versa, until neutralisation occurs. Because both the acid and base are strong (high Ka and Kb values), they will fully dissociate, which means that all the molecules of acid or base will separate into ions. Equivalent amounts of H+ and OH- ions combine to form H2O at the equivalence point, resulting in a pH of 7.0. (neutral).
In aqueous solution, an acid that has been completely ionised. In contrast to a weak acid, when a strong acid is placed in a solution such as water, all of the strong acid dissociates into its ions. The general equation for strong acid dissociation is:
HA(aq)→H+(aq)+A−(aq)
The H stands for hydrogen, and the A stands for the acid's conjugate base (anion).
A base that is completely ionized in aqueous solution. This means when the strong base is placed in a solution such as water, all of the strong base will dissociate into its ions. The general equation of the dissociation of a strong base is:
XOH(aq)→X+(aq)+OH−(aq)
The OH represents hydroxide and the X represents the conjugate acid (cation) of the base.
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What temp is the warmest?
A. 30 degrees celsius
B. 273 kelvin
C. 0 degrees celsius
D. 32 degrees Fahrenheit
Answer:
30 degrees Celsius, is 86 Fahrenheit.
273 kelvin, is 31.73 Fahrenheit.
0 degrees Celsius, is 32 Fahrenheit.
Then 32 degrees Fahrenheit.
The correct answer choice is A. 30 degrees Celsius.
calculate the ph of a buffer solution obtained by dissolving 29.029.0 g of kh2po4(s)kh2po4(s) and 44.044.0 g of na2hpo4(s)na2hpo4(s) in water and then diluting to 1.00 l.
The pH of buffer solution obtained will be 7.05 by dissolving 29.029.0 g of kh2po4(s)kh2po4(s) and 44.044.0 g of na2hpo4(s)na2hpo4(s) in water and then diluting to 1.00 l.
This can be calculated using use Henderson - Hasselbalch equation:
PH = Pka + ㏒ [A/AH]
Molar mass of KH₂PO₄ = 136.0 g And Molar mass of Na₂HPO₄ = 142.0 g
No. of moles of H₂PO₄⁻ = No. of moles of KH₂PO₄ = (29..0 g) / (136.0 g/mol) = 0.213 mol
No. of moles of HPO₄²⁻ = No. of moles of Na₂HPO₄ = (44.0 g) / (142.0 g/mol) = 0.30 mol
In the solution, [HPO₄²⁻]/[H₂PO₄⁻] = 0.213/0.30
Henderson-Hasselbalch equation:
pH = pKₐ + log([HPO₄²⁻]/[H₂PO₄⁻])
pH = 7.21 + log(0.213/0.30)
pH = 7.05
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an ax ceramic compound has the rock salt crystal structure. if the radii of the a and x ions are 0.137 nm and 0.241 nm, respectively, and the respective atomic weights are 22.7 g/mol and 91.4 g/mol, what is the density of this material?
The density of the material would be 1.75 gm/cc.
p = n'∑Ac + ∑AA/VcNA
= n'(∑Ac + ∑AA)/9³NA
=n'(∑Ac + ∑AA)/(2(rA + rX))³ NA
n' = number of atoms per unit cell
= 4(assumption)
rA = 0.137 × 10⁻⁷ cm
rX = 0.241 × 10⁻⁷ cm
NA = Avagadros number
= 6.022 × 10²³
∑Ac = Atomic weight of all cations
∑AA = Atomic weight of all anions
p = n'(∑Ac + ∑∑AA)/(2(rA + rx))³NA
= 4(22.7 + 91.4/(2(0.137 × 10⁻⁷ + 0.241 × 10⁻⁷))³ 6.022× 10²³
= 1.75 gm/cc
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a student places a piece of i2(s) in 50.0 ml of h2o(l), another piece of i2(s) of the same mass in 50.0 ml of c6h14(l), and shakes the mixtures. the results are shown above. what do the results indicate about the intermolecular interactions of the substances?
When a piece of I2 in 50 ml of water is placed then another piece of I2 of the same mass in C6H14 is placed then hydrogen bonding is formed in water and a strong London dispersion force occurs.
C6H14 is a straight chain alkane with 6 carbon atoms with no double or triple bond.this is non polar. So, London dispersion forces exist.this is the force that exists between all molecule.this is the weakest intermolecular forces.the boiling point of C6H14 increases as their atomic mass increases due to stronger London dispersion force.
Water has strong intermolecular forces.in this,hydrogen bonding and dipole moment created by the strong electronegative oxygen and hydrogen.water has hydrogen bond,dipole induced dipole forces and London dispersion forces.
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Energy made available through the flow of electric current is called...
Radiant
Sound
Elastic
Electrical
The energy transfer in the form of light or heat is called radiant energy. Thus the flow of electric current can be called as radiant.
What is radiation?Radiation is a mod of energy transfer through vacuum and the electromagnetic radiations are such energy transfer from stars and space which hits the earth surface.
Sound is a mechanical wave only travels through a medium whereas electromagnetic waves does not need a medium to travel. Electromagnetic radiation is the combination of an electric field and magnetic field.
Hence, the flow of electric current by which the energy made available is called radiant.
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