A)
n - 1 \[\ell \]- 0 m - 0 s - \[1/2\]
B)
n - 1 \[\ell \]- 1 m - 1 s - \[1/2\]
C)
n - 2 \[\ell \]- 0 m - 0 s - \[-1/2\]
D)
n - 2 \[\ell \]- 1 m - 0 s - \[+1/2\]
Correct Answer: C
Solution :
\[_{4}Be\Rightarrow 1{{s}^{2}}2{{s}^{2}}\] \[\Rightarrow \] \[n=2,\,\ell =0,\,m=0,\,s=+\frac{1}{2}\] or \[-\frac{1}{2}\]
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