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In that they have different masses due to difference in neutrone number
The atomic particles of an isotope are the proton, electron and neutron
An atom or element that have different masses are known as isotopes.
Neutrone number difference
The isotopes have different masses.
Isotopes are atoms with the same number of protons (same atomic number) but different numbers of neutrons, leading to different atomic masses. For example, carbon-12 and carbon-14 are isotopes of carbon with atomic number 6 but atomic masses of 12 and 14 respectively.
The atomic mass of an element is the weighted average of masses of the isotopes of the element, weighted in proportion to their abundance.
Isotopes describe atoms with different atomic masses due to varying numbers of neutrons.
They have different numbers of neutrons. Due to a difference in number of neutrons, they also have different masses. For example, take the element carbon. Carbon could have six neutrons (12C) or eight neutrons (14C). Both 14C and 12C are isotopes of carbon and therefore have different masses.
Mass of isotopes are not integers.
Atoms of the same element that have different masses are called isotopes of the element. The presence of different numbers of neutrons in the nucleus is responsible for the existence of isotopes of an element.
atomic masses