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Question

Which d-block element in the fourth period has the highest first ionization enthalpy?

Options

Choose one · Correct answer highlighted

Explanation

In period 4 d-block (Sc to Zn), ionization enthalpy increases across due to increasing nuclear charge, with Zn (3d¹⁰ 4s²) having the highest due to its full d-subshell stability.

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