(D)
in any atom the protons always equal the electrons, which is the atomic number.
The only thing left that can vary is the number of neutrons, which gives a different mass number (protons+neutrons)
How do two isotopes of the same element compare with each other?
A.They have the same number of protons but a different number of electrons.
B.They have the same mass number but a different number of protons.
C.They have the same mass number but a different number of neutrons.
D.They have the same number of protons but a different number of neutrons.
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