Question

Name
(i) two elements having valency 2 with respect to oxygen.
(ii) two elements forming oxides of the types XO3.
(iii) an element having number of electrons double in its L-shell than that present in its M-shell.

Answer 1

Answer:

1) sulphur and scandium

2) aluminiun and iron

3) silicon

Explanation:

Answer 2

Answer:

1- Magnesium,calcium

2- Sodium,potassium

3- Silicon

electronic configuration of silicon

= 2,8,4

K,L,M

Explanation:

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