How many electrons does a hydrogen atom have?

A hydrogen atom has one electron. This is because hydrogen is the simplest and most abundant element in the universe, consisting of only one proton in its nucleus and a single electron orbiting around that nucleus. The electron is what allows hydrogen to engage in chemical bonding and participate in reactions, making it fundamental to the structure of matter.

In the context of the choices given, having zero electrons would imply a complete absence of the atom itself, while having two or three electrons would represent either a completely different atom or the existence of negative ions or isotopes not relevant to neutral hydrogen. Therefore, the accurate count of electrons for a neutral hydrogen atom is one, reinforcing option B as the correct answer.