Which of the following statements is FALSE?
(A) an atom consists of a positively charged, massive nucleus that occupies very little volume and electrons that go round the nucleus
(B) the number of electrons in an atom is equal to the number of protons
(C) the mass of an atom is equal to the number of protons + the number of neutrons
(D) isotopes of an atom contain different numbers of electrons
(E) the mass of a proton is approximately the same as the mass of a neutron
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