Question

(1) The alkali metal in period - 2
The number of electron shells in elements of period-3
(iii) The formula of hydroxide of the element having electronic configuration 2,8,2
(iv) The valency of elements in group IIA

(v) The non metal in period -3 having a valency 1 (5)​

Answer 1

Answer:

1. Lithium, Li

2. 3 shells

3. X(OH)2 or Mg(OH)2 as the element is Mg with valency 2

4. 2

5. Chlorine, Cl

hope this will help you

Answer 2

Answer:

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