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The ground state electronic configuration of Cr is [Ar] 4s 1 3d 5 or 1s 2 2s 2 2p 6 3s 2 3p 6 4s 1 3d 5 The 19th electron is 4s 1 ∴ For 4s 1 electron n = 4, l = 0, m = 0, s = +1/2 or -1/2.

Structure of Atom

Question

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With the help of ground state electronic configuration of element Cr(Z= 24), deduce the possible values of four quantum numbers for the 19th electron of Cr.

Answer

The ground state electronic configuration of Cr is
[Ar] 4s¹ 3d⁵ or 1s² 2s² 2p⁶ 3s² 3p⁶ 4s¹ 3d⁵
The 19th electron is 4s¹
∴ For 4s¹ electron
n = 4, l = 0, m = 0, s = +1/2 or -1/2.