Question

Which statement best explains how isotopes can have different masses and still be the same element?

A
The quantity of protons identifies the element but changes if the mass of the isotope differs from what is shown on the periodic table.

B
The sum of the electrons and neutrons equals the isotope's mass with the proton amount being given by the atomic number.

C
The sum of the protons and electrons equals the mass of the isotope, and the neutron amount is equal to the atomic number.

D
The quantity of protons identifies the element and cannot change; therefore, the neutron amount