Q.

All isotopes of the same element have

A. different atomic numbers and different atomic mass
B. different atomic numbers and the same atomic mass
C. the same atomic number but different atomic masses
D. the same atomic number and the atomic mass
Answer» C. the same atomic number but different atomic masses
Explanation: Isotopes are forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei. So they have the same atomic number, but differ in relative atomic mass.
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