Which Two of the Ions Below Have the Same Number ${ }_{53}^{127} \mathrm{I}^{-}$

Which two of the ions below have the same number of electrons?
${ }_{53}^{127} \mathrm{I}^{-}$ , ${ }_{50}^{119} \mathrm{Sn}^{2+}$ , ${ }_{82}^{207} \mathrm{~Pb}^{2+}$ , ${ }_{82}^{207} \mathrm{~Pb}^{4+}$ , ${ }_{56}^{137} \mathrm{Ba}^{2+}$

A) ${ }_{53}^{127} \mathrm{I}^{-}$ and ${ }_{56}^{137} \mathrm{Ba}^{2+}$
B) ${ }_{53}^{127} \mathrm{I}^{-}$ and ${ }_{50}^{119} \mathrm{Sn}^{2+}$
C) ${ }_{82}^{207} \mathrm{~Pb}^{2+}$ and ${ }_{56}^{137} \mathrm{Ba}^{2+}$
D) ${ }_{50}^{119} \mathrm{Sn}^{2+}$ and ${ }_{56}^{137} \mathrm{Ba}^{2+}$
E) ${ }_{82}^{207} \mathrm{~Pb}^{2+}$ and ${ }_{82}^{207} \mathrm{~Pb}^{4+}$