Formulae of covalent molecules.

Covalent molecules are made of non- metals chemically combined together.

Part 1: Monoatomic atoms
Yes, you are right. You see atoms here. 

Remember, Group 0 or VIII elements are monoatomic. In other words, they exist as atoms. 

Reason: The atoms in this group have a completely filled valence shell. 

Part 2: Di- atomic molecules
All the -gen and -ine exist as diatomic molecules.

Oxygen, nitrogen, and hydrogen exist as di- atomic molecules.
diatomic molecules, the gens, oxygen, nitrogen, hydrogen
Formulae of diatomic molecules - The "Gens" (oxygen, nitrogen and hydrogen)

Fluorine, chlorine, bromine, iodine, astatine exist as di- atomic molecules.

diatomic molecules, Group VII, covalent molecules, fluorine, chlorine, bromine, iodine, astatine
Formulae of diatomic molecules - Group VII molecules (or the "Ines")








Part 3: Other formulae you need to remember

Name
Formulae
ammonia
NH3
Hydrogen peroxide
H2O2
Water
H2O
Carbon dioxide
CO2
Carbon monoxide
CO
Hydrogen chloride
HCl
Sulfur dioxide
SO2

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