Beryllium has one more electron than lithium. Can this additional electron fit in the 2s subshell?

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The first ring can fit 2 valance electrons the 2and 3rd ring can fit 8 valance elctrons. The substances want to be eaual.

Explanation:

Octect rule- Atoms need 8 valance electrons to become stable (you need 8 to be great).

Enert- Noble Gasses don't bond because they already have 8 valance electrons.

Metals-lose electrons-Cation

Non metals-gain electrons-Anion

Bonds occur due to the transfer of valence electrons lost/gained.

Ionic bonds-One of many occur between meets and non metals.

  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-

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