Question

Why size of atom doesn't increase regularly in period

Answer 1

Explanation:

The size of an atom decreases across the period because the electrons which are added in the element are in the same shell, which increases the nuclear charge by the nucleus. ... So the nuclear charge is greater than the repulsion of surrounding electrons in the orbital. Hence size of atom decreases across the period

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Answer 2

hlo mates....

The size of atom doesn't decrease regularly due to the reason of lanthanide contraction .there is slightly increase or or almost no increase in atomic radius from 5th to 6th period in transition metal

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