Question

How the ion energy changes
elements of same period ?
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Answer 1

Answer:

Rationale for the Periodic Trends in Ionization Energy

The ionization energy of an element increases as one moves across a period in the periodic table because the electrons are held tighter by the higher effective nuclear charge.

Answer 2

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Across a period from left to right, the ionisation energy increases. This is due to the increase in nuclear charge having a greater pull on the electrons and therefore more energy is required to remove electrons. Going down a group, the ionisation energy decreases.

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