Give the formulate of the compounds formed from the following sets of elements:
(a) calcium and fluorine
(b) hydrogen and sulphur
(c) nitrogen and hydrogen
(d) carbon and chlorine
(e) sodium and oxygen
(f) carbon and oxygen
(a) The valency of calcium is 2 and that of fluorine is -1. So according to the valencies of both the elements, the formula becomes CaF2.
(b) The valency of hydrogen is 1 and that of sulphur is -2. So according to the valencies of both the elements, the formula becomes H2S.
(c) The valency of nitrogen is -3 and that of hydrogen is 1. So according to the valencies of both the elements, the formula becomes NH3.
(d) The valency of carbon is 4 and that of chlorine is -1. So according to the valencies of both the elements, the formula becomes CCl4.
(e) The valency of sodium is 1 and that of oxygen is -2. So according to the valencies of both the elements, the formula becomes Na2O.
(f) The valency of carbon is 4 and that of oxygen is -2. So according to the valencies of both the elements, the formula becomes CO2.