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Question
Give the formulae of the compounds formed from the following sets of elements :
- calcium and fluorine
- hydrogen and sulphur
- nitrogen and hydrogen
- carbon and chlorine
- sodium and oxygen
- carbon and oxygen
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Solution
- Compound formed with calcium and fluorine will have the chemical formula CaF2. (valency of Ca is 2 and that of F is 1)
- Compound formed with hydrogen and sulphur will have the chemical formula H2S. (valency of S is 2 and that of H is 1)
- Compound formed with nitrogen and hydrogen will have the chemical formula NH3. (valency of N is 3 and that of H is 1)
- Compound formed with carbon and chlorine will have the chemical formula CCl4. (valency of C is 4 and that of Cl is 1)
- Compound formed with sodium and oxygen will have the chemical formula Na2O. (valency of Na is 1 and that of O is 2)
- 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)
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