Differing nuclei of the same element are called - isotopes, Isotopes are forms of an element with - the same atomic number but a different mass number., protium, deuterium and tritium - are isotopes of hydrogen, Water made with deuterium - is called heavy water, Lithium has - two naturally-occuring isotopes, Isotopes of an element - have different masses, Some isotopes - are stable and some are unstable, C-14 - is unstable, The original nucleus - is the parent nucleus, the transformed nucleus - is the daughter nucleus, Atoms which emit ionising radiation - are radioactive,

Isotopes

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