Q21 · CSIR-NET Chemistry, June 2013

Paper: CSIR-NET June 2013 · Subject: Physical Chemistry · Chapter: Atomic and Molecular Term Symbol · Topic: Term Symbols Atoms · Marks: 2 · Difficulty: Easy

What is the atomic term symbol for helium atom with electronic configuration $1 \mathrm{s}^{2}$ ?

(a)${ }^{2} \mathrm{S}_{1 / 2}$

(b)${ }^{1} \mathrm{P}_{0}$

(c)${ }^{1} \mathrm{S}_{0}$

(d)${ }^{1} \mathrm{S}_{1}$

Answer

Answer: C ✓ checked by 4AB · confidence high

Explanation

He 1s²: S = 0, L = 0, J = 0 — ¹S₀ (c).

Study loop for Atomic and Molecular Term Symbol