1.Atomic & subatomic Levels
All living and nonliving matter is formed of simple units called atoms and sub atomic particles such as protons, electrons & neutrons.
●2.Molecular level
Elements do not occur in isolated forms.
•Molecule
The atoms of different elements combine with each other through ionic and covalent bonding to produce compounds. This stable form is called a molecule.
Example: Hydrogen, carbon, oxygen, nitrogen, phosphorus, and sulphur.
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