The answer is (c)
An alpha particle consists of
In fact, an alpha particle is simply the nucleus of a helium-4 atom.
Because alpha particles do not contain any electrons, you must identify which of the chemical species given as options do not contain any electrons.
Right from the start, the hydrogen ion,
As you know, a neutral hydrogen atom contains
When the hydrogen atom loses its electron, the hydrogen ion is formed. You can thus say that the hydrogen ion contains the same number of electrons as an alpha particle, i.e.
That said, it's worth noting that alpha particles contain the same number of protons as a
#"2 protons and 0 electrons " implies " 2+ charge"#