protons
Isotopes of the same element have a different number of neutrons.
The atomic number is the same for the isotopes of a chemical element.
Isotopes of the same element have the same number of protons and electrons, but varied numbers of neutrons.
The isotopes of an element have the same number of protons, but different numbers of neutrons.
If an atom of the same element has the same number of protons but a different number of neutrons, then they are isotopes.
Isotopes of the same element have different number of neutrons.
Isotopes are different forms of the same element which have different numbers of neutrons in their atomic nuclei. A given element is identified by the number of protons in its nucleus; that's its atomic number. Two different isotopes of the same element have the same number of protons, but each has a different number of neutrons in its nucleus. Different isotopes of the same element are chemically the same.
Isotopes of the same element have different numbers of neutrons.
Isotopes are atoms of the same element that are only different by the number of neutrons they have
Isotopes of the same element have different numbers of neutrons in their atomic nuclei. This results in isotopes having slightly different atomic masses while maintaining the same number of protons (which determines the element's identity).
Two different isotopes of an element have different numbers of neutrons. That's what an isotope is. So, no, isotopes of an element can not have the same number of neutrons.
Yes, isotopes of an element are the same element but with different numbers of neutrons in the nucleus and thus different atomic masses.