Question

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Answer 1

Answer:

sodium 2,8,1

magnesium 2,8,2

z 18 so valency 0

valence electrons Al-3

Cl-7

O-6

element y- oxygen

Answer 2

Explanation:

1) Na-2,8,1-1s2,2s2,2p6,3s1

Mg-2,8,2-.......3s2

2)valency-0,8

argon

3)a-8. (as Valence e are e in outermost orbit)

b-8

c-8

4)atomic no-8

a mass-16

Oxygen