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\subsection{Shells of Electrons}  It is more appropriate to talk about shells than energy levels, due to complexity of atoms beyond hydrogen.\\  Each shell has a maximum number of electrons that it can hold. For a higher value of $n$, the shell is further from the nucleus and has greater energy.  \begin{table}[] \begin{table}[!htbp]  \centering  \begin{tabular}{lll}  First Shell & $n=1$ & 2 electrons \\ 
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\item $n=4$ has s, p, d, and f  \end{itemize}  \begin{table}[] \begin{table}[!htbp]  \centering  \begin{tabular}{ll}  Sub-Shell & Maximum number of electrons \\