Chlorine, achemical element with the price Cl and also atomic number 17, is an extremely reactiveelement and also strongest oxidizing agent together it has actually the highest electron affinity andthird highest possible electronegativity follow to the Pauli scale amongst theelements.

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One the the mostcommon compound in the chemical industry and also real-life usage constituentsodium chloride (NaCl) contains chlorine. It is supplied as sanitation, disinfection,antiseptics, weapons in people war I, and also other so many things.

You are here toknow valence electrons of a chlorine atom, aren’t you? Don’t worry in addition to chlorinevalence electrons us will explain its valency also. But prior to that let’s havesome simple ideas about what these 2 terms are:

Difference BetweenValence Electrons and also Valency

Valence electronsare the total variety of electrons present in the outermost shell of an atom(i.e. In outermost orbital). The valence electrons because that a neutral atom arealways definite, it can not be varied (more or less) in any type of condition because that aparticular atom and also may or might not be same to its valency.


Valency is definedas the total variety of electrons one atom have the right to lose, gain, or share at the timeof bond development to gain a stable digital configuration i.e. To complete anoctet. The valency of one atom have the right to be change in different compounds orchemical reactions due to the different bonding circumstances. Many of the timevalency varies/changes due to readjust in oxidation and also reduction states.

Chlorine (Cl)Valence Electrons

There are foursimple measures to discover out the valence electrons for chlorine atom i beg your pardon are:

Step 1: find theAtomic Number


To discover out theatomic number of chlorine, we deserve to use the regular table. Through the assist of theperiodic table, us can easily see the the atomic variety of chlorine is 17. Asits atom number is 17, it has 17 protons, and also for neutral chlorine, thenumber of protons is constantly equal to the variety of electrons i.e. Has 17electrons in that is nucleus.

Step 2: WriteElectron Configuration


Electronconfiguration is the plan of electrons on the orbitals. The chlorineatom has actually a total of 17 electron so, we need to put 17 electron in orbitals.The electrons will be placed in various orbitals according to the energylevel: <1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p, 6s, 4f, 5d, 6p, 7s, 5f>.Now,

Chlorine electronconfiguration Cl (17) =1s22s22p63s23p5(completeconfiguration).

= 3s²3p⁵(condensed configuration).

Step 3: DetermineValence Shell

As us know, thevalence shell of one atom can be discovered from the highest variety of principlequantum numbers which room expressed in the hatchet of n, and in 3s²3p⁵, thehighest worth of n is 3 so that the valence covering of chlorine is3s²3p⁵.

Step 4: FindValence Electrons

The total number ofelectrons current in the valence covering of an atom are called valence electrons,and there are a full of seven electrons current in the valence shell of chlorine(3s²3p⁵). Thus,chlorine has seven valence electrons.

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Valency that Chlorine(Cl)

There are manydifferent means to find out the valency of an atom which reflects the capability ofan atom come bond with other atoms. Valence explains how easily an atom or afree radical can integrate with various other chemical species. The valency of one atom isdetermined based upon the variety of electrons lost, gained, or mutual withanother atom at the moment of bond formation.

An atom is stated tobe stable as soon as its outermost shells have actually eight electrons (except H & He).If the total number of electrons in outermost shells is between one come four,the atom has actually positive valency and if electron are between four come eight, thevalency is calculate by subtracting from eight and also valency will be zero. Atomshaving 4 outermost electrons possess both optimistic and negative valency, andatoms having eight outermost electrons, valency will be zero (i.e. Noblegases).

Elements choose chlorinecan with the steady state (nearest inert gas configuration: Ar) by obtaining oneelectron.So the the valency that chlorine is 1.

Mathematically, theelectronic construction of chlorine is 2, 8, 7. And as us know, if electronsin outermost shell exceed native 4, it need to be subtracted native 8. So,

ElectronConfiguration that chlorine (Cl) = 2, 8, 7

We have the right to see the outermost covering of chlorine has actually 7 electrons so, have to subtract that from 8.

8 – 7 = 1

That’s why valencyof chlorine is 1.

Note: In general, chlorinehas a steady oxidation state the -1 most of the time yet it have the right to differ insome compounds v values 0 (Cl2), +1 (NaClO), +3 (NaClO2), +4 (ClO3), +5 (NaClO3),+7 (NaClO4). Carry out not confuse v -1 or something rather (+1, +3, +4, etc.) with positive or negative signs, the is simply an oxidation number that can vary from compound to compound. Yet its valency is constantly 1 in any type of case.

In one more sense, achlorine atom can kind a best of one covalent bond in a chemistry bonding (Forexample: HCl, CCl4, CaCl2, etc.), and also that what valency is, the best abilityto kind bonds with atoms at the time of chemical bonding.

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We can likewise findthe valency that chlorine v the aid of the regular table. As chlorinebelongs to group 17 (17A or VIIA) together with fluorine (F), bromine (Br), and also iodine(I), and astatine (At). These group facets are additionally called halogens. All theseelements have valency one.