How many neutrons are in a hydrogen-1 atom?

Hydrogen-1, also known as protium, consists of one proton and one electron but has zero neutrons. This makes it the simplest and most common isotope of hydrogen. Other isotopes, like deuterium (1 neutron) or tritium (2 neutrons), differ in neutron count. Options B, C, and D are incorrect, as hydrogen-1 specifically has no neutrons, a fundamental characteristic in atomic structure studies.