Structure of the Atom

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The atomic number of the element magnesium (Z = 12, A = 25)Mg is

(Z = 13, A = 27)X and (Z = 14, A = 28)Y have the:

The number of neutrons of a chlorine atom that has 17 protons, 17 electrons and 37 nucleons is:

The charge of nucleus of the element argon (Z = 18, A = 38)Ar is:

(Z = 12, A = 24)Mg and (Z = 12, A = 25)X have the:

The average atomic mass of magnesium – 24 and magnesium – 25 is:

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

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