Chemistry · Classification of Elements and Periodicity in Properties

The first ionisation enthalpies of Na, Mg, Al and Si are in the order:

Verified Solution4 OptionsUpdated: October 2026👁️1 View

1Na > Mg > Al < Si
2Na < Mg < Al < Si
3Na > Mg > Al > Si
4Na Al < Si✓

Correct answer

Na Al < Si

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The first ionisation enthalpies of Na, Mg, Al and Si are in the order:

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