It's called a valence electron, and there's 1 for a hydrogen atom
Hydrogen typically has 0 neutrons.
Radium has one valence electron.
One. A hydrogen atom contains only one electron, and it is a valence electron.
A hydrogen atom has 1 valence electron.
Hydrogen has 0 neutrons
Hydrogen chloride (HCl) has 7 valence electrons. Hydrogen contributes 1 valence electron and chlorine contributes 7 valence electrons.
Hydrogen has 1 electron, (1 proton) and 0 neutrons.
Astatine has 125 neutrons
Hydrogen only has 1 electron.
Only one valence electron.
1
1 proton, no neutrons