Yes, it is true.
Isotopes are atoms of the same elements with different number of neutrons.
The atomic number of the isotopes of an element is identical; the mass number is different.
Since you have isotopes of elements. Isotopes are elements with different number of neutrons hence why the different atomic masses for the same elements.
elements are isotopes, when different atoms of the same element have different number of neutrons
nuetrons
Many elements have different isotopes: 1) Carbon - Carbon 12, Carbon 14 2) Hydrogen - Protium, Deuterium, Tritium 3) Chlorine - Chlorine 35, Chlorine 37 etc
Isotopes differ in the number of neutrons they possess.
Isotopes of elements are atoms with the same number of protons but different numbers of neutrons. This causes isotopes of the same element to have different atomic masses. Isotopes can be stable or unstable, with unstable isotopes undergoing radioactive decay.
The isotopes of the same element have an identical number of protons and electrons; the number of neutrons is different.
Because of the difference in mass number. Isotopes must have different numbers of neutrons.
Elements can exist in the form of different isotopes. Isotopes of the same element have the same number of protons in their nuclei but have different numbers of neutrons. The first gives them the same atomic number and chemical properties while the second gives them different atomic weights.
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.