Neutral aluminium-27 has 13 electrons and 14 neutrons. Bromide ion-80 has 36 electrons and 45 neutrons. Mercury-201 ion has 78 electrons and 121 neutrons. Neutrons equal mass number minus protons and electrons account for charges.
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Element B is more reactive because it needs only one electron to attain stability. Both elements are non-metals, so they share electrons to form covalent bonds, resulting in the molecular compound AB3 or PCl3.
The resulting chemical formulae are Mg3N2, Li3N, Na2S and Al2O3. In each compound, the combining valencies of the metal and non-metal elements are criss-crossed to establish an electrically neutral ionic substance.