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Give the formulae of the compounds formed from the following sets of elements: 

1. Calcium and fluorine 

2. Hydrogen and sulphur 

3. Nitrogen and hydrogen 

4. Carbon and chlorine 

5. Sodium and oxygen 

6. Carbon and oxygen.

1 Answer

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1. Calcium and fluorine

Symbol Charges Formula
Ca +2 CaF2
F 1-

2. Hydrogen and sulphur 

Symbol Charges Formula
H 1+ H2S
S 2-

3. Nitrogen and hydrogen

Symbol Charges Formula
N 3+ NH3
H 1-

4. Carbon and chlorine 

Symbol Charges Formula
C 4+ CCl4
Cl 1-

5. Sodium and oxygen

Symbol Charges Formula
Na 1+ Na2O
O 2-

6. Carbon and oxygen

Symbol Charges Formula
C 2+ CO2
O 1-

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