Question

Why does effective nuclear charge increase across a period?

Answer 1

The first ionisation energy generally increases on going across a period. This is because on crossing a period, more protons are being added to the nuclei of the atoms. This results in an increase in nuclear charge. The electrons in the outer energy levels will be more tightly held, and more difficult to remove.

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Answer 2

Answer:

Across a period, the numbers of protons are increasing along with the electrons. But since the elecrons are all in the same shell, they are unable to shield the increasing attractive force of the protons.So the effective nuclear charge increases across a period.

Explanation:

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