Select the correct statement about isotopes.
A) Isotopes of the same element have the same atomic number but differ in their atomic masses.
B) All the isotopes of an element have the same number of neutrons.
C) All the isotopes of an element are radioactive.
D) Isotopes occur only in the heavier elements.
Answer: A) Isotopes of the same element have the same atomic number but differ in their atomic masses.
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