The atomic mass of the element calcium Ca (Z = 20, A = 20) is:

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

The charge of the electron cloud of the element magnesium Mg (Z= 12, A = 24) is::

The atomic mass of an oxygen atom that has 17 nucleons and 9 neutrons is:

The atomic mass of a sodium atom that has 11 protons, 11 electrons and 12 neutrons is:

The charge of a fluorine atom that has 9 protons, 9 electrons and 11 neutrons is:

The average atomic mass of carbon – 12 and carbon – 14 is:

Isotopes have:

(Z= 12, A = 23)Mg and (Z =12, A =25)X have the:

(Z =13, A=27)X and (Z =14, A =27)X have the:

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