Bromine, a chemicalelement with the price Br and also atomic number 35, is a very reactive gas so thatdoes not take place in free states but exists together halide salt or table salts. In ~ standardtemperature and also pressure, that is discovered as a liquid like mercury.

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You are below toknow valence electrons of bromine atom, aren’t you? Don’t worry together with brominevalence electrons us will define its valency also. But prior to that let’s havesome straightforward ideas about what these 2 terms are:

Difference BetweenValence Electrons and also Valency

Valence electronsare the total number of electrons existing in the outermost shell of an atom(i.e. In outermost orbital). The valence electrons because that 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 its valency.


Valency is definedas the total variety of electrons one atom can lose, gain, or share at the timeof bond formation to obtain a stable digital configuration i.e. To finish anoctet. The valency of an atom deserve to be variable in different compounds orchemical reactions because of the different bonding circumstances. Most of the timevalency varies/changes due to adjust in oxidation and also reduction states.

Bromine (Br)Valence Electrons

There are 4 simplesteps to uncover out the valence electrons because that bromine atom which are:

Step 1: uncover theAtomic Number


To find out theatomic variety of bromine, we have the right to use the routine table. With the help of theperiodic table, us can quickly see the the atomic variety of bromine is 35. Asits atomic number is 35, it has 35 protons, and also for neutral bromine, the numberof proton is constantly equal to the variety of electrons i.e. Has 35 electrons inits nucleus.

Step 2: WriteElectron Configuration


Electronconfiguration is the plan of electron on the orbitals. The bromine atomhas a full of 35 electrons so, we have to put 35 electron in orbitals. Theelectrons will certainly be put in various orbitals according to the power level:<1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p, 6s, 4f, 5d, 6p, 7s, 5f>. Now,

Bromine electronconfiguration Br (35) =1s22s22p63s23p63d104s24p5(completeconfiguration).

= 4s² 3d¹⁰ 4p⁵(condensed configuration).

Step 3: DetermineValence Shell

As us know, thevalence shell of an atom deserve to be uncovered from the highest variety of principlequantum numbers are expressed in the hatchet of n, and in 4s² 3d¹⁰ 4p⁵, the highest possible value of n is 4 so the the valence shell of bromine is4s² 3d¹⁰ 4p⁵.

Step 4: FindValence Electrons

The full number ofelectrons present in the valence covering of one atom are dubbed valence electrons,and there are a full of seven electrons existing in the valence shell of bromine(4s² 3d¹⁰ 4p⁵). Thus,bromine has actually seven valence electrons.

Valency the Bromine(Br)

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

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

Elements prefer brominecan with the stable state (nearest inert gas configuration: Ar) by getting oneelectron.So that the valency the bromine is 1.

Mathematically, theelectronic construction of bromine is 2, 8, 18, 7. And as we know, ifelectrons in the outermost shell exceed from 4, it should be subtracted from 8. So,

ElectronConfiguration of bromine (Br) = 2, 8, 18, 7

We deserve to see theoutermost shell of bromine has 7 electron so, need to subtract that from 8.

8 – 7 = 1

That’s why valencyof bromine is 1.

Note: In general, brominehas a stable oxidation state the -1 many of the time yet it have the right to differ insome compounds with values 0 (Br2), +1 (NaBrO), +3 (NaBrO2), +4 (BrO3), +5 (NaBrO3),+7 (NaBrO4). Carry out not confuse v -1 or something rather (+1, +3, +4, etc.) with a positive or an unfavorable sign, that is simply an oxidation number that can vary from link to compound. Yet its valency is constantly 1 in any case.

In one more sense, abromine atom can kind a preferably of one covalent shortcut in a chemical bonding (For example:HBr, CH3Br, CaBr2, etc.), and also that what valency is, the maximum capacity to formbonds through atoms at the moment of chemical bonding.

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We can also findthe valency the bromine with the assist of the periodic table. Together bromine belongsto team 17 (17A or VIIA) in addition to fluorine (F), chlorine (Cl), iodine (I), andastatine (At). This group facets are additionally called halogens. All these elementshave valency one.