Question

solve qstn no. 14 .... chemistry of 10th class... solve write down d ansrs fast... ​

Answer 1

Answer:

Explanation:

Valence electrons in the same shell (outermost shell) increase progressively by one across the period. The first element of sodium has one valence electron and magnesium has two valence electrons. On moving from left to right in the third period, valency increases from 1 to 7 and ultimately to zero in the last group.

Answer 2

Answer :-

b) Similarly, in third period the number of valence electrons increases from 1 (Na) to 8 (Ar) i.e., from left to right, whereas the valency increases from 1 (Na) to 4 (Si) and then decreases from 4 to 0 (Ar).a