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