Neutrons of course?!
Isotopes. They differ in the number of neutrons in the nucleus.
Isotopes have a different number of neutrons.
Isotopes have different number of neutrons.
Isotopes of a chemical element have a similar number of protons but a different number of neutrons.
Isotopes have a different number of neutrons.
Not; the number of protons in isotopes is identical; only the number of neutrons is different.
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.
If an atom of the same element has the same number of protons but a different number of neutrons, then they are isotopes.
If they have the same atomic number but different mass, then they have a different number of neutrons, and they are called ISOTOPES.
The number of neutrons is different for isotopes.
The atomic number of the isotopes of an element is identical; the mass number is different.
Isotopes are atoms of the same elements with different number of neutrons.