The isotopes of the same element have an identical number of protons and electrons; the number of neutrons is different.
Isotopes are atoms of the same elements with different number of neutrons.
Isotopes are forms of the same element that differ in Neutrons.
Uranium has a number of isotopes including U235 and U238, both of which are radioactive
Since you have isotopes of elements. Isotopes are elements with different number of neutrons hence why the different atomic masses for the same elements.
Neutrons
neutrons
elements are isotopes, when different atoms of the same element have different number of neutrons
scientists Can tell the difference between two isotopes of the same element because, isotopes of the same elements always have the same number of protons.
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The proton and electron number are equal for all isotopes of the same specific element.
Many elements have different isotopes: 1) Carbon - Carbon 12, Carbon 14 2) Hydrogen - Protium, Deuterium, Tritium 3) Chlorine - Chlorine 35, Chlorine 37 etc
The answer you are looking for is "isotopes" HOWEVER, please note you CAN NOT HAVE 2 elements with the same number of PROTONS. This is because the number of protons DEFINES an element. Isotopes are the SAME element but with differing numbers of neutrons.