Q61 · CSIR-NET Chemistry, December 2015

Paper: CSIR-NET December 2015 · Subject: Inorganic Chemistry · Chapter: Coordination Chemistry · Topic: Electron Transfer Redox · Marks: 2 · Difficulty: Medium

Possible term symbol(s) of the excited states of Na atom with the electronic configuration $[1s^{2}2s^{2}2p^{6}3p^{1}]$ is/are

(a)$^{2}S_{1/2}$

(b)$^{2}P_{3/2}$ and $^{2}P_{1/2}$

(c)$^{1}S_{0}$ and $^{1}P_{1}$

(d)$^{3}P_{0}$ and $^{3}P_{1}$

Answer

Answer: B ✓ checked by 4AB · confidence high

The source book printed no answer; this one was worked out and checked — see the explanation.

Explanation

One electron in 3p: L = 1, S = ½ → ²P, with J = 3/2 and 1/2: ²P₃/₂ and ²P₁/₂ (the sodium D-line doublet).

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