"element" is a very confusing word for what you are asking. But what I think you are asking is what part of an atom does not change with an isotope. I'll answer that question.
An isotope of an atom is a variation fo the element in which the atom has a different number of neutrons. However, the number of protons can never change in a single element. So no matter how many atoms of a certain element are gathered, no matter how many different isotopes there are, they all have the exact same number of protons.
Polonium is the element in group 16 that has unstable isotopes. It is a radioactive element with no stable isotopes.
An atom or element that have different masses are known as isotopes.
Isotopes contribute to the atomic weight of a chemical element.
Isotopes of the same element have different numbers of neutrons.
They are isotopes of that element, they have different neutron numbers.
Isotopes of the same element have different number of neutrons.
Polonium is the element in group 16 that has unstable isotopes. It is a radioactive element with no stable isotopes.
Isotopes of the same element have a different number of neutrons.
An atom or element that have different masses are known as isotopes.
How isotopes same as element alike?
No - the lightest element Hydrogen has three known isotopes
Isotopes of the same element have different numbers of neutrons and mass.
Isotopes contribute to the atomic weight of a chemical element.
Atoms of the same element with different atomic masses are known as isotopes. Isotopes differ only by the number of neutrons present in the nucleus of the isotopes. The number of protons is the same for all isotopes of an element (because if there were different numbers of protons, then the atoms would not be of the same element).
Isotopes are atoms of an element having different number of electrons.
You have not told us what element "this" element is.
Isotopes of the same element have different numbers of neutrons.