Answer:
(1) (a)
\[\begin{align}
&
\,\,\,\,\,\,\,\,\begin{matrix}
{} & 1s & 2s & 3s
& 2p \\
n & 1 & 2 & 3
& 2 \\
l & 0 & 0 & 0
& 1 \\
\end{matrix} \\
&
\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ \\
&
(n+l)\,\,\,\,\,\,1\,\,\,\,\,\,\,\,\,2\,\,\,\,\,\,\,\,\,\,\,3\,\,\,\,\,\,\,\,\,\,\,3
\\
\end{align}\]
\[1s<2s<2p<3s\]
(b)
\[\begin{align}
&
\,\,\,\,\,\,\,\,\begin{matrix}
{} & 4s & 3s & 3p
& 4d \\
n & 4 & 3 & 3
& 4 \\
l & 0 & 0 & 1
& 2 \\
\end{matrix} \\
&
\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ \\
&
(n+l)\,\,\,\,\,\,4\,\,\,\,\,\,\,\,\,3\,\,\,\,\,\,\,\,\,\,\,4\,\,\,\,\,\,\,\,\,\,\,6
\\
\end{align}\]
\[3s<3p<4s<4d\]
(c)
\[4d<5p<6s<4f<5d\]
(d)
\[\begin{align}
&
\,\,\,\,\,\,\,\,\begin{matrix}
{} & 5f & 6d & 7s
& 7p \\
n & 5 & 6 & 7
& 7 \\
l & 3 & 2 & 0
& 1 \\
\end{matrix} \\
&
\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ \\
&
(n+l)\,\,\,\,\,\,8\,\,\,\,\,\,\,\,\,8\,\,\,\,\,\,\,\,\,\,\,7\,\,\,\,\,\,\,\,\,\,\,8
\\
\end{align}\]
\[7s<5f<6d<7p\]
(II) (a)
\[\begin{align}
&
\,\,\,\,\,\,\,\,\begin{matrix}
{} & 4d & 4f & 5s
& 5p \\
n & 4 & 4 & 5
& 5 \\
l & 2 & 3 & 0
& 1 \\
\end{matrix} \\
&
\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ \\
&
(n+l)\,\,\,\,\,\,6\,\,\,\,\,\,\,\,\,7\,\,\,\,\,\,\,\,\,\,\,5\,\,\,\,\,\,\,\,\,\,\,6
\\
\end{align}\]
5s orbitals will have highest
energy.
(b)
\[\begin{align}
& \,\begin{matrix}
{} & 5p & 5d & 5f
& 6s & 6p \\
n & 5 & 5 & 5
& 6 & 6 \\
l & 1 & 2 & 3
& 0 & 1 \\
\end{matrix} \\
&
\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ \\
&
(n+l)\,\,\,6\,\,\,\,\,\,\,7\,\,\,\,\,\,\,\,\,\,\,\,\,8\,\,\,\,\,\,\,\,\,\,\,6\,\,\,\,\,\,\,\,\,\,7
\\
\end{align}\]
\[5f\]orbitals will have highest
energy.
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