Category Archives: Atomic structure definitions

Atomic structure definitions

Mass number: The total number of protons and neutrons in an atom is called its mass number. Atomic number: the total number of protons (=electrons) in an atom. This number characterises the element type. Isotopes: Atoms of the same element can have different numbers of neutrons; these atoms are called isotopes of that element. Relative atomic mass (Ar): compares the mass of atoms of

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