Q50 · CSIR-NET Chemistry, December 2015

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

The term symbol for the first excited state of Be with the electronic configuration $1s^{2}2s^{1}3s^{1}$ is.

(a)$^{3}S_{1}$

(b)$^{3}S_{0}$

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

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

Answer

Answer: A ✓ checked by 4AB · confidence high

Explanation

1s²2s¹3s¹: L = 0; the triplet (S = 1) is lower than the singlet, and J = 1 only: ³S₁.

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