\begin{table}%[t!]
\caption{\label{tab:abon-chimi}Elemental abundances with respect to total hydrogen.}
%\centering

\begin{tabular}{lc}
\hline
\hline
Element & Abundance\\
\hline
\vspace{-0.25cm}\\
C & $1.38 \times 10^{-4}$\\
O & $3.02 \times 10^{-4}$\\
N &$7.95 \times 10^{-5}$\\
Mg &$1.00 \times 10^{-8}$\\
S &$2.00 \times 10^{-6}$\\
Si &$1.73 \times 10^{-8}$\\
Fe &$1.70 \times 10^{-9}$\\
\hline
\end{tabular}
\end{table}