Question

atom, ion or isotope? what is this? proton neutron electron

Explanation:

An atom is a neutral particle with equal number of protons and electrons. An ion has a charge due to a different number of protons and electrons. An isotope is an atom of the same element with a different number of neutrons. In the diagram, the number of protons and electrons appears to be equal, and there is no indication of a different - than - normal neutron count.

Answer:

Atom