Some help with formulae of covalent molecules?

1-Hydrogen
2-Oxygen
3-Nitrogen
4-Chlorine
5-Bromine
6-Iodine
7-Water
8-Carbon dioxide
9-Methane(carbon and hydrogen atoms)
10-Ammonia(nitrogen and hydrogen atoms)
11-Sulphur dioxide
12-Dinitrogen tetroxide

Answer:
1-Hydrogen = H2
2-Oxygen = O2
3-Nitrogen = N2
4-Chlorine = Cl2
5-Bromine = Br2
6-Iodine = I2
7-Water = H2O
8-Carbon dioxide = CO2
9-Methane = CH4
10-Ammonia = NH3
11-Sulphur dioxide = SO2
12-Dinitrogen tetroxide = N2O4
1. H2
2. O2
3. N2
4. Cl2
5. Br2
6. I2
7. H2O
8. CO2
9. CH4
10. NH3
11. SO2
12. N2O4
OH^-
O^2-
NO3^-
Cl^-
Br^-
J^-
H2O
CO2
CH4
NH3
SO2
N2O4
1. H2
2. O2
3. N2
4. Cl2
5. Br2
6. I2
7. H2O
8. CO2
9. CH4
10. NH3
11. SO2
12. N2O4
H2
O2
N2
Cl2
Br2
I2
H2O
CO2
CH4
NH3
SO2
N2O4

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