Physics – 5.1.2 The nucleus | e-Consult
5.1.2 The nucleus (1 questions)
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(a) Atomic number (Z) represents the number of protons in the nucleus of an atom. Mass number (A) represents the total number of protons and neutrons in the nucleus of an atom.
(b) The atomic number tells us the element to which the atom belongs. It is unique for each element. For example, all atoms with an atomic number of 6 are Carbon.
(c) The mass number tells us the total number of nucleons (protons and neutrons) in the nucleus of an atom. It is a whole number.