Bromine, a chemicalelement v the price Br and also atomic number 35, is a very reactive gas for this reason thatdoes not happen in complimentary states yet exists together halide salts or table salts. At standardtemperature and pressure, the is discovered as a liquid choose mercury.

You are watching: How many outer electrons does bromine have

You are below toknow valence electron 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 simple ideas about what these 2 terms are:

Difference BetweenValence Electrons and Valency

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


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

Bromine (Br)Valence Electrons

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

Step 1: find theAtomic Number


To discover out theatomic number of bromine, we deserve to use the routine table. Through the help of theperiodic table, we can quickly see the the atomic number of bromine is 35. Asits atom number is 35, it has actually 35 protons, and for neutral bromine, the numberof protons is always equal come the number of electrons i.e. Has 35 electrons inits nucleus.

Step 2: WriteElectron Configuration


Electronconfiguration is the plan of electrons on the orbitals. The bromine atomhas a full of 35 electron so, we have to put 35 electron in orbitals. Theelectrons will certainly be placed in various orbitals follow to the energy 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 one atom can be found from the highest variety of principlequantum numbers space expressed in the ax of n, and in 4s² 3d¹⁰ 4p⁵, the highest value that n is 4 so the the valence shell of bromine is4s² 3d¹⁰ 4p⁵.

Step 4: FindValence Electrons

The total number ofelectrons current in the valence covering of an atom are dubbed valence electrons,and there room a full of seven electrons existing in the valence covering of bromine(4s² 3d¹⁰ 4p⁵). Thus,bromine has seven valence electrons.

Valency the Bromine(Br)

There space manydifferent means to find out the valency of an atom which mirrors the capacity ofan atom come bond with other atoms. Valence explains how conveniently an atom or afree radical can incorporate with various other chemical species. The valency of an atom isdetermined based upon the variety of electrons lost, gained, or mutual withanother atom at the moment of bond formation.

An atom is claimed tobe stable when its outermost shells have eight electrons (except H & He).If the total variety of electrons in outermost shells is between one come four,the atom has positive valency and if electron are in between four to eight, thevalency is calculated by subtracting from eight and valency will certainly be zero. Atomshaving 4 outermost electrons own both hopeful and negative valency, andatoms having actually eight outermost electrons, valency will be zero (i.e. Noblegases).

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

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

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

We can see theoutermost shell of bromine has actually 7 electrons so, have to subtract it from 8.

8 – 7 = 1

That’s why valencyof bromine is 1.

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

In one more sense, abromine atom can form a best of one covalent bond in a chemistry bonding (For example:HBr, CH3Br, CaBr2, etc.), and that what valency is, the maximum capability to formbonds through atoms at the moment of chemistry bonding.

See more: Does Cos Have A Dipole Moment, Access To This Page Has Been Denied

We can additionally findthe valency that bromine v the help of the regular table. Together bromine belongsto group 17 (17A or VIIA) in addition to fluorine (F), chlorine (Cl), iodine (I), andastatine (At). These group elements are additionally called halogens. Every these elementshave valency one.