for the electronic configuration $1 \mathrm{s}^{2} 2 \mathrm{s}^{1} 2 \mathrm{p}^{4}$ two of the possible term symbols are ${ }^{1} \mathrm{S}$ and ${ }^{3} \mathrm{P}$. the remaining term is
(a)${ }^{1} \mathrm{D}$
(b)${ }^{1} \mathrm{F}$
(c)${ }^{3} \mathrm{D}$
(d)${ }^{3} \mathrm{F}$
Answer
Answer: A ✓ checked by 4AB · confidence medium
Explanation
The p⁴ (≡ p²) core gives ³P, ¹D and ¹S; with ¹S and ³P given, the remaining term is ¹D (a).