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Question

Which element in the fourth period has the highest fifth ionization enthalpy?

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Choose one · Correct answer highlighted

Explanation

Fifth ionization enthalpy peaks when removing an electron from a stable X⁴⁺ ion. P (after losing four electrons, becomes P⁴⁺ with 1s² 2s² 2p⁶) has the highest value in period 4.

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