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The first ionization energy (in kJ/mol) of Na, Mg, Al and Si respectively, are:

1. 496, 577, 786, 737
2. 786, 737, 577, 496
3. 496, 577, 737, 786
4. 496, 737, 577, 786

Correct answer: 496, 737, 577, 786

Solution

The correct option reflects the increasing trend in ionization energy across the period, where sodium has the lowest ionization energy due to its single valence electron, and silicon has a higher ionization energy due to its greater nuclear charge and electron configuration.

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