what are isotopes give two examples
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Elements having same atomic number but different atomic masses are known as Isotopes. Carbon, 136Carbon, 146Carbon, Hydrogen-1, Deuterium–2, Tritium-3 are three isotopes of hydrogen.
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each of two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei, and hence differ in relative atomic mass but not in chemical properties; in particular, a radioactive form of an element.
example: "some elements have only one stable isotope"
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