- the basic building block of matter
- one type atom
- may exist as atoms or molecule
- Periodic table-Group-Period-ZigZag line
Compound | Constituent elements |
Water | 2 atoms of hydrogen + 1 atom of oxygen |
Sodium Chloride | 1 atom of sodium + 1 atom of chlorine |
Carbon Dioxide | 1 atom of carbon + 2 atoms of oxygen |
Sulphur Dioxide | 1 atom of sulphur + 2 atoms of oxygen |
Hydrogen Chloride | 1 atom of oxygen + 1 atom of chlorine |
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