contestada

Which of the following statements about isotopes is/are TRUE?
(I) Isotopes of the same element differ only in the number of electrons they contain.
(II) Isotopes of the same element have the same mass.
(III) Isotopes of the same element have the same number of protons but a different number of neutrons.
A) I only
B) I and II
C) III only
D) II and III
E) All statements are true.

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