Question

valency atomic size and metallic non metallic proportion change in group and period​

Answer 1

1. Atomic size : Decrease acrosses a period from left to right and increases down a group

2. Valency : Increases across a period from left to right and decreases down a group

3. Metalic property : Decreases across a period from left to right and increases down in a group .

4. Non Metalic property : Opposit of no.3