Complete the following half reactions by adding atom, ion, or electrons. Then label the half$-$

reaction as oxidation or reduction.

$MgM{g}^{2+}$

$C^{2+}+4e^{-}$

$2e^{-}{N}^{3-}$

$C{l}^{-}Cl$

$Si{e}^{-}$