Question

Give the formulae 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

Answer 1

(a) Compound formed with calcium and fluorine will have the chemical formula CaF₂. (valency of Ca is 2 and that of F is 1)
(b) Compound formed with hydrogen and sulphur will have the chemical formula H₂S. (valency of S is 2 and that of H is 1)
(c) Compound formed with nitrogen and hydrogen will have the chemical formula NH₃. (valency of N is 3 and that of H is 1)
(d) Compound formed with carbon and chlorine will have the chemical formula CCl₄. (valency of C is 4 and that of Cl is 1)
(e) Compound formed with sodium and oxygen will have the chemical formula Na₂O. (valency of Na is 1 and that of O is 2)
(f) Compound formed with carbon and oxygen will have the chemical formula CO₂. (valency of C is 4 and that of O is 2, divided by the common factor of 2)