Ravi Shankar Sharma, Subha Raghavan and, Nidhi Sharma Solutions for Chapter: Periodic Classification of Elements, Exercise 4: PAPER - PEN TEST : 4

How valency of elements varies across a period.

How valency of elements varies down a group?

Define valence electrons.

What happens to the trend of valence electrons on moving from $\mathrm{Li}$ to $\mathrm{K}$?

What happens to the trend of valency on moving from $\mathrm{B}\mathrm{e}$ to $\mathrm{C}\mathrm{a}$?

Define atomic radius.

Among sodium or chlorine atom, which is bigger in size? Give reason.

What happens to the trend of metallic character on moving from $\mathrm{F}$ to $\mathrm{I}$? Give reason.