Q9 · CSIR-NET Chemistry, June 2019

Paper: CSIR-NET June 2019 · Subject: Physical Chemistry · Chapter: Atomic and Molecular Term Symbol · Topic: Term Symbols Atoms · Marks: 2 · Difficulty: Easy

the term symbol for ground state dinitrogen cation radical ( $\mathrm{N}_{2}^{+}$) is

(a)${ }^{2} \Pi_{u}$

(b)${ }^{2} \Sigma_{\mathrm{u}}^{-}$

(c)${ }^{2} \Pi_{\mathrm{g}}$

(d)${ }^{2} \Sigma_{\mathrm{g}}^{+}$

Answer

Answer: D ✓ checked by 4AB · confidence high

Explanation

N₂ has its HOMO at 3σg (σ2p). Removing one electron leaves (3σg)¹, giving N₂⁺ the ground term ²Σg⁺ (d).

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