An atom of hydrogen-2 contains one proton, one neutron, and one electron. Which particle (s) identify the atom as hydrogen?

the electron

the neutron

the proton

the proton and the neutron

E.) The proton and the neutron

Explanation:

Not hydrogen. They have electrons. Electrons don't matter much and the mass of atom as you already know consists of protons and neutrons.

The correct options are: a. the electron; c. the proton

Explanation:

Hydrogen is the first chemical element of the periodic table, that belongs to group 1 and period 1. It is an s-block element with atomic number 1.

There are three isotopes of hydrogen: protium (¹H), deuterium (²H) and tritium (³H).

Protium is the most abundant isotope, having one electron, one proton and zero neutron.

Whereas, deuterium or hydrogen-2, has one electron, one proton and one neutron.

Therefore, an atom having one electron and one proton is identified as hydrogen atom.