Question

what is Ionization energy? How in varies in period?
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Answer 1

Answer:

Ionization energy increases in a period and decreases down the group. In a period as there is successive addition of electron atomic size decreases so more energy is required to remove an electron thus IE increase.

Answer 2

Answer:

Ionization energy increases in a period and decreases down the group

In a period as there is successive addition of electron atomic size decreases so more energy is required to remove an electron thus IE increase

In a group successive addition of shells occur so the atomic size decreases so it is easy to remove electron hence IE decreases