Amongst the following 3d-series elements, having highest value of first ionization enthalpy is _____.

Q.1 (ix) Amongst the following 3d-series elements, having highest value of first ionization enthalpy is _____.

A. Zn

B. Cu

C. Co

D. Sc

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Answer: A. Zn

Answer: (a) Zn

Zinc has the completely filled stable configuration [Ar]3d¹⁰4s², and its 4s electron is held more strongly because of the higher nuclear charge, so its first ionization enthalpy (about 906 kJ mol⁻¹) is the highest of these. Approximate values: Cu 745, Co 760, Sc 633 kJ mol⁻¹.

Doubtly AI · 27 Oct 2026 AI-verified · Oct 2026 Report

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Amongst the following 3d-series elements, having highest value of first ionization enthalpy is _____.

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