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The correct ground state electronic configuration of chromium atom is

$\begin{array}{1 1}(a)\;[Ar]3d^54s^1&(b)\;3d^44s^2\\(c)\;3d^64s^0&(d)\;4d^44s^1\end{array}$

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Nearly half filled orbitals tends to acquire exactly half filled nature.
Hence (a) is the correct answer.
answered Jan 10, 2014 by sreemathi.v

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