Respuesta :
Answer: Neutrons
Explanation:
Isotopes are atoms of the same element that have different numbers of neutrons but the same number of protons and electrons. The difference in the number of neutrons between the various isotopes of an element means that the various isotopes have different masses.
Answer:
neutrons
Explanation:
isotopes has the same proton number but different nucleon number because there's different numbers of neutrons in isotopes