* Protons: 1
* Neutrons: 0
* Electrons: 1
Explanation:
* Protons: Protons are positively charged particles found in the nucleus of an atom. The number of protons determines the element. Hydrogen, being the simplest element, has only one proton.
* Neutrons: Neutrons are neutral particles (no charge) also found in the nucleus. Hydrogen's most common isotope (hydrogen-1) has no neutrons. There are heavier isotopes of hydrogen (deuterium and tritium) that do have neutrons, but hydrogen-1 is the most abundant.
* Electrons: Electrons are negatively charged particles that orbit the nucleus. Hydrogen has one electron to balance the one positive charge of the proton.
Key Point: The number of protons defines an element. So, any atom with one proton will be a hydrogen atom.
