The electronic configuration of an atom of element X is 2,8,2 what will be the valency of the element x ​

The element is Magnesium

it has electronic configuration

or

In valence cell it has 2 electrons and therefore its valency is 2

? you expect us to answer this? ? this is your schoolwork, i don't think we can with this, i think it would considering being

  the   balanced   equation   for   reaction of   ca metal   with   o2 to   produce   cao   is as below

2 ca+ o2→ 2 cao2

  explanation

the reaction is   balanced     since the   number of atoms   in reactant side is   equal to   number of atoms   in   product side.   for   example   they   are 2   atom of   ca in   reactant   side   and   2   atoms of ca   in   the product side.

  the   process   is a   meet the   requirement   of   redox   reaction because :     calcium   is   oxidized   from   oxidation state 0   to 2+   while   oxygen   is reduced from   oxidation   state   0   to 2-