Question

Write down the trends in modern periodic table ( both in groups and periods) for following-
- Valency
- Atomic size

Answer 1

Answer:

1. a) Valency with respect to hydrogen: Firstly increases then decreases through a period and remain same along a group.

b) Valency with respect to oxygen: Increases through a period and remain same along a group.

2. Atomic size decreases from left to right i.e. along period and increases from top to bottom i.e. along a group.