Moving from Copper () to Zinc () at the very end of the 3d series, the atomic radius slightly increases. This expansion is primarily due to:

Question

Moving from Copper ($Cu$) to Zinc ($Zn$) at the very end of the 3d series, the atomic radius slightly increases. This expansion is primarily due to:

Prashant Kotian · Accepted Answer

Correct answer: B. At the end of the series, the orbitals become completely filled (). The extreme crowding and electron-electron repulsion within this penultimate shell overwhelm the effective nuclear charge, causing the valence shell to expand.

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