All isotopes of the same element have _____

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All isotopes of the same element have ______

1. different atomic numbers and different atomic mass
2. different atomic numbers and the same atomic mass
3. the same atomic number but different atomic masses
4. the same atomic number and the atomic mass

Correct Option: C

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. For example, carbon-12, carbon-13 and carbon-14 are three isotopes of the element carbon having the same atomic number of 6, but with mass numbers 12, 13 and 14 respectively.