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Why is there a gradual increase in the ionisation energy from \( L i \) to \( N e ? \)

1. Increase in atomic size
2. Decrease in nuclear charge
3. Atomic size remains same
4. Increase in nuclear charge

Correct answer: Increase in nuclear charge

Solution

From Li to Ne, each successive element has a higher nuclear charge, so the nucleus pulls the valence electrons more strongly. Because the added electrons go into the same shell, shielding does not increase enough to offset this, so ionisation energy rises gradually.

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