Give the formulae of the compounds formed from the following sets of elements
(a) Calcium and fluorine
Ans. CaF2
(b) Hydrogen and sulphur
Ans. H2S
(c)Nitrogen and hydrogen
Ans. NH3
(d)Carbon and chlorine
Ans. CCI4
(e)Sodium and oxygen
Ans. Na2O
(f) Carbon and oxygen
Ans. CO, CO2
