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https://youtu.be/aKVonDfbHrQ

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Classification of Matter as Element Compound and Mixture - Chemical Nature of Matter(CBSE Chemistry)

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5.The first 20 elements and their symbols

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5.The first 20 elements and their symbols

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:--When two or more atoms of the same element combine they form the molecule of  an element.
Monoatomic:--  A monoatomic  molecule contains only one atom.
Diatomic-- A diatomic molecule contains two atoms.
Triatomic :-- A triatomic molecule contains three atoms.

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The molecules of a compound are represented by a chemical formula that indicates the number of atoms of each element present in a single molecule of compound.

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goo.gl/XcCoSs8

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A polyatomic molecule contains more than three atoms.

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9 Difference between compounds and mixtures

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9 Difference between compounds and mixtures