Question

In modern periodic table the period no.indicates the

Answer 1

Explanation:

in the modern periodic table the period indicates to the principal quantum number (n)

Answer 2

Answer:Number of shells

Explanation:In modern periodic table,the period(horizontal rows) indicates the number of shells of that element.

For example :-

Let's take Chlorine (Atomic no-17)

*Electronic configuration - 2,8,7

~Group = 17th (Halogen family)

~Period = 3