Question

Isotopes have same atomic number but different______.​

Answer 1

Answer:

Different isotopes of the same element have the same atomic number. They have the same number of protons. The atomic number is decided by the number of protons. Isotopes have different mass numbers, though, because they have different numbers of neutrons.

Answer 2

Answer:

Atomic mass

Explanation:

An atom's mass number tells you the number of protons and neutrons that atom has in its nucleus. Atoms that have the same atomic number, but different mass numbers are called isotopes.