Answer
See the answer below.
Work Step by Step
There are $2\ell+1$ orbitals per subshell, therefore:
$\begin{smallmatrix}
Label&\ell&2\ell+1\\
\hline\\
s&0&1\\
p&1&3\\
d&2&5\\
f&3&7\\
\end{smallmatrix}$
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