# Why do atoms have no overall electrical charge?

For the isolated, NEUTRAL atom, there are necessarily equal number of protons and electrons. If an atom loses an electron or so, it becomes a positively charged ion, a cation, i.e. ${M}^{+}$; if an atom gains an electron or so, it becomes a negatively charged anion, i.e. ${X}^{-}$, ${O}^{2 -}$, ${P}^{3 -}$ etc.
Why can't an atom, $X$, lose the other fundamental particle, the proton, to form ${X}^{-}$?