Question

what changes that occour when we go down in periodic table

Answer 1

NON-METALS reactivity INCREASES as you go UP a Group because the higher up and to the right atoms are, the higher the electronegativity, resulting in a more vigorous exchange of electrons.

Answer 2

DOWN A PERIODIC TABLE---
Metallic character increases.
No of electron shells increases by 1.
Valence electrons remain same.
Chemical properties remain similar.
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