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

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Answer:

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.