The Ground-State Energy of an Electron in a Hydrogen Atom $-13.6 \mathrm{eV}$

Multiple Choice

The ground-state energy of an electron in a hydrogen atom is $-13.6 \mathrm{eV}$ . This means that the binding energy of that electron is

A) $-13.6 \mathrm{eV}$ .
B) $+13.6 \mathrm{eV}$ .
C) Some other value (specify) .