The atomic number of the element sodium (Z = 11, A = 23)Na is:

The charge of the nucleus of the element neon (Z = 10, A = 20)Ne is:

The charge of the electron cloud of the element potassium (Z = 19, A = 39)K is:

The atomic mass of an oxygen atom that has 16 nucleons and 8 neutrons is:

The mass number of a magnesium atom that has 12 protons, 12 electrons and 13 neutrons is:

The number of neutrons of a fluorine atom that has 9 protons, 9 electrons and 19 nucleons is:

The average atomic mass of chlorine – 35 and chlorine – 37 is:

Isotopes have the:

(Z = 12, A = 25)Mg and (Z = 13, A = 25)X have the:

(Z = 14, A = 27)X and (Z = 14, A = 28)X have the:

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