Question

The element A belongs to second period and 17th group and the element B belongs to third period and second group of the periodic table

1) write the subshell electronic configuration of A

2) To which blocks does B belong? what is its valency?

3) Give the formula of the compound by A and B?​

Answer 1

Explanation:

ANSWER

An element X belongs to group 2 and period 3 of the periodic table so it have valency of +2 (due to 2 valence electron) and it will form

X(NO

3

)

2

,XSO

4

,X

3

(PO

4

)

2

.

Answer 2

Answer:

what is subshell configaration