Chlorine, achemical facet with the prize Cl and atomic number 17, is very reactiveelement and also strongest oxidizing agent as it has the greatest electron affinity andthird highest possible electronegativity follow to the Pauli scale amongst theelements.

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One that the mostcommon compounds in the chemistry industry and real-life usage constituentsodium chloride (NaCl) contains chlorine. It is supplied as sanitation, disinfection,antiseptics, weapons in world war I, and other so plenty of things.

You are right here toknow valence electron of a chlorine atom, aren’t you? Don’t worry in addition to chlorinevalence electrons we will define its valency also. But prior to that let’s havesome an easy ideas around what these two terms are:

Difference BetweenValence Electrons and Valency

Valence electronsare the total number of electrons existing in the outermost shell of one atom(i.e. In outermost orbital). The valence electrons for a neutral atom arealways definite, it cannot be varied (more or less) in any type of condition for aparticular atom and may or may not be same to the valency.


Valency is definedas the total number of electrons an atom can lose, gain, or share at the timeof bond formation to get a stable digital configuration i.e. To complete anoctet. The valency of an atom can be change in different compounds orchemical reactions due to the various bonding circumstances. Many of the timevalency varies/changes due to adjust in oxidation and also reduction states.

Chlorine (Cl)Valence Electrons

There space foursimple measures to discover out the valence electrons for chlorine atom which are:

Step 1: discover theAtomic Number


To find out theatomic variety of chlorine, we have the right to use the routine table. Through the assist of theperiodic table, us can easily see that the atomic variety of chlorine is 17. Asits atomic number is 17, it has actually 17 protons, and also for neutral chlorine, thenumber of protons is constantly equal come the variety of electrons i.e. Has actually 17electrons in its nucleus.

Step 2: WriteElectron Configuration


Electronconfiguration is the plan of electron on the orbitals. The chlorineatom has actually a total of 17 electrons so, we need to put 17 electron in orbitals.The electrons will certainly be put in various orbitals follow 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 we know, thevalence shell of one atom can be discovered from the highest number of principlequantum numbers which are expressed in the ax of n, and also in 3s²3p⁵, thehighest worth of n is 3 so the the valence covering of chlorine is3s²3p⁵.

Step 4: FindValence Electrons

The total number ofelectrons existing in the valence shell of an atom are called valence electrons,and there space a complete of 7 electrons present in the valence shell of chlorine(3s²3p⁵). Thus,chlorine has actually seven valence electrons.

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Valency that Chlorine(Cl)

There are manydifferent means to uncover out the valency of an atom which shows the capability ofan atom come bond with various other atoms. Valence explains how conveniently an atom or afree radical can combine with various other chemical species. The valency of one atom isdetermined based on the number of electrons lost, gained, or common withanother atom at the moment of bond formation.

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

Elements like chlorinecan with the secure state (nearest inert gas configuration: Ar) by acquiring oneelectron.So that the valency the chlorine is 1.

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

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

We deserve to see the outermost shell of chlorine has 7 electrons so, have to subtract the from 8.

8 – 7 = 1

That’s why valencyof chlorine is 1.

Note: In general, chlorinehas a stable oxidation state that -1 most of the time but it have the right to differ insome compounds v values 0 (Cl2), +1 (NaClO), +3 (NaClO2), +4 (ClO3), +5 (NaClO3),+7 (NaClO4). Execute not confuse v -1 or something rather (+1, +3, +4, etc.) with positive or an unfavorable signs, that is simply an oxidation number that can vary from link to compound. However its valency is always 1 in any kind of case.

In another sense, achlorine atom can form a best of one covalent link in a chemical bonding (Forexample: HCl, CCl4, CaCl2, etc.), and that what valency is, the best abilityto form bonds through atoms at the moment of chemical bonding.

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We can likewise findthe valency of chlorine through the help of the regular table. As chlorinebelongs to group 17 (17A or VIIA) together with fluorine (F), bromine (Br), and iodine(I), and also astatine (At). This group aspects are also called halogens. All theseelements have actually valency one.