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) Sodium and oxygen​

Answer 1

ANSWER

1. Calcium and fluorine 

 Symbol  Ca  F

 Charges +2  1−

 Formula CaF2

2. Hydrogen and sulphur 

 Symbol  H  S

 Charges 1+  2−

 Formula H2S

3. Nitrogen and hydrogen

 Symbol  N  H

 Charges 3−  1+

 Formula NH3 

4. Carbon and chlorine

 Symbol  C  Cl

 Charges 4+  1−

 Formula CCl4

5. Sodium and oxygen

 Symbol  Na  O

 Charges 1+  2−

 Formula Na2O 

6. Carbon and oxygen.

 Symbol  C  O

 Charges 4+  2−

C2O4 i. e.

 Formula CO2