Question

How does the number of : (I) valence electrons and (ii) valency vary on moving from left to right in the third period of the periodic table ?​

Answer 1

Answer:

I) valence electrons increases by 1 on moving from left to right across a period until it reaches 8

ii)valency increases from 1 to 4 then again decreases to 0 across a period from left to right

Answer 2

1. Valence electrons have same shell (outermost shell) increase progracevily by one across the period.
2. On moving from left to right in the third period. valence increase from 1 to 7 and ultimately zero in the last.