What is the answer?

In an atom, protons plus neutrons make up the atom's

OPTIONS:
- electric charge.
- atomic mass.
- atomic number.
- electron number.
atomic mass.
Vad är svaret? I en atom utgör protoner plus neutroner atomens ALTERNATIV: - elektrisk laddning. - Atommassa. - Atomnummer. - Elektronnummer.
What's the answer? In an atom, protons plus neutrons make up the ALTERNATIVE of the atom. - Atomic mass. - Atomic number. Electron number.
Atommassa.
Atomic mass.