Question

What is the variation of Trend in non metals in groups and periods according to modern periodic table.

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Answer 1

The tendency to gain electrons increases on moving across a period due to an increase in the nuclear charge and decrease in the atomic size. Hence, the non-metallic character increases across a period. As we move down the group, the non-metallic character decreases due to increase in the atomic size.

Answer 2

Variation of trend in non metals in groups:- Metallic character decreases down the group since electronegativity decreases down the group as because the atomic size increases and Ionisation potential decreases. That's why electronegative character decreases so non metallic character decreases.

Variation of trend in non metals in periods:- Non metallic character increases along the period because there is decrease in electronegativity along the period. This is the reason why ionisation potential decreases so electropositive character increases.