Magnesium, achemical facet with the prize Mg and also atomic number 12, is shining grey whitesolid appearance aspect with the lowest melting and also boiling points among all thealkaline planet metals.

You are watching: How many valence electrons in magnesium

Magnesium has a greatbiological role. The necessary interaction between phosphate and also magnesium ionsmakes magnesium a an extremely essential facet to the nucleic acid of every cells. Also, that isused as nutrition in diet, metabolism, detection in serum and also plasma, therapy, etc.

You are right here toknow valence electrons of a magnesium atom, aren’t you? Don’t worry along with magnesiumvalence electrons we will describe its valency also. But before that let’s havesome an easy 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 varied (more or less) in any kind of condition because that aparticular atom and may or might not be same to that is valency.


Valency is definedas the total variety of electrons an atom can lose, gain, or share in ~ the timeof bond formation to acquire 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 various bonding circumstances. Many of the timevalency varies/changes early to readjust in oxidation and reduction states.

Magnesium (Mg)Valence Electrons

There are four simplesteps to discover out the valence electrons because that magnesium atom i m sorry are:

Step 1: uncover theAtomic Number


To find out theatomic variety of magnesium, we can use the regular table. Through the help of theperiodic table, us can quickly see that the atomic variety of magnesium is 12. Asits atomic number is 12, it has 12 protons, and for neutral magnesium, thenumber of proton is always equal to the number of electrons i.e. Has actually 12electrons in that is nucleus.

Step 2: WriteElectron Configuration


Electronconfiguration is the setup of electron on the orbitals. The magnesiumatom has a full of 12 electron so, we need to put 12 electrons in orbitals.The electrons will be placed in different orbitals follow to the energylevel: <1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p, 6s, 4f, 5d, 6p, 7s, 5f>.Now,

Magnesium electronconfiguration Mg (12) = 3s2(completeconfiguration).

=1s22s22p63s2(condensed configuration).

Step 3: DetermineValence Shell

As us know, thevalence shell of one atom can be uncovered from the highest variety of principlequantum numbers which are expressed in the term of n, and in 3s2, thehighest value of n is 3 so that the valence covering of magnesium is3s2.

Step 4: FindValence Electrons

The full number ofelectrons current in the valence covering of one atom are referred to as valence electrons,and there space a complete of two electrons existing in the valence covering of magnesium(3s2). Thus,magnesium has actually two valence electrons.

Valency of Magnesium(Mg)

There space manydifferent ways to discover out the valency of an atom which mirrors the capacity ofan atom to bond with various other atoms. Valence explains how quickly an atom or afree radical can incorporate 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 claimed tobe stable as soon as its outermost shells have eight electrons (except H & He).If the total variety of electrons in outermost shells is between one to four,the atom has actually positive valency and also if electrons are between four come eight, thevalency is calculate by individually from eight and also valency will certainly be zero. Atomshaving 4 outermost electrons own both optimistic and an adverse valency, andatoms having actually eight outermost electrons, valency will certainly be zero (i.e. Noblegases).

Elements like magnesiumcan with the stable state (nearest inert gas configuration: Ne) by losing twoelectrons.So the the valency of magnesium is 2.

Note: Usually, magnesiumhas a secure oxidation state the +2 many of the time but it might differ insome compounds. Execute not confuse v +2 or something else (+1, +3, +4, etc.)with a positive or an adverse sign, the is just an oxidation number that deserve to vary from link to compound. But its valency is always 2 in any case.

In another sense, amagnesium atom can form a best of two covalent bond in a chemistry bonding (Forexample: MgO, MgCl2, MgSO4, etc.), and also that what valency is, the preferably abilityto form bonds through atoms at the time of chemistry bonding.

See more: How Many Days Has It Been Since January 1 2000 ? How Long Ago Was January 1St 2000

We can also findthe valency the magnesium with the assist of the routine table. As magnesiumbelongs to group 2A (or IIA) in addition to beryllium (Be), calcium (Ca), strontium(Sr), barium (Ba), and also radium (Ra). These group aspects are likewise called alkalineearth metals. Every these facets have valency two.