The third ionisation energy is maximum for:

aluminium

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boron

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magnesium

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beryllium

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Solution

The correct option is D beryllium
The third ionization energy of beryllium is maximum because the ${B e}^{2 +}$ ion has a filled-shell electron configuration.
${M g}^{+ 2}$ also has a filled shell electron configuration but due to its large size, ionisation energy decreases.

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