The order of increasing ionization energy of Mg, Al, Si, and Na is Na < Al < Mg < Si.

True

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False

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Solution

The correct option is A True
Ionization energy is the minimum energy that an electron in a gaseous atom or ion has to absorb to come out of the influence of the nucleus.
The increasing order of first ionization energy is Na<Al<Mg<Si
From left to right, the ionization energy increases.
So the expected order is Na<Mg<Al<Si
But in magnesium, a stable 3s configuration is present. Therefore, its ionization energy is greater than that of aluminium.
Mg:1s²2s²2p⁶3s²
So the correct order is Na < Al < Mg < Si.
Hence the given statement is True.

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