Some Basic Concepts of Chemistry

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Dalton's Atomic Theory

1. All substances are made up of tiny, indivisible particles called atoms.
2. Atoms of the same element are identical in shape, size, mass and other properties.
3. Atoms of different elements are different in all respects.
4. Atom is the smallest unit that takes part in chemical reactions.
5. Atoms combine with each other in simple whole number ratios to form molecules.
6. Atoms cannot be created, divided or destroyed during any chemical or physical change.