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Topic Content:
- Meaning of Molecule
- Size of a Molecule
- Determination of Size of a Molecule
Most substances cannot exist as individual atoms, instead, they combine their atoms with themselves or other atoms to form molecules.
A molecule is a group of two or more atoms, held together by attractive forces known as chemical bonds, that form the smallest particle of a substance which can have a separate existence and still retain the composition and chemical properties of that substance.
For example, water (H2O) has three atoms, two hydrogen (H) atoms and one oxygen (O) atom.
All molecules are in constant motion. Molecules of a liquid have more freedom of movement than those in a solid. Molecules in a gas have the greatest degree of motion.
Size of a Molecule:
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