Valency- Trick to memorise within 15 seconds (1-10 elements)

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You can watch the other videos chapter-wise. Links for the other videos are below.
Atoms and Molecules
1. Atoms and Molecules - Introduction | Class 9th | CBSE | Chemistry | Chapter-3
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2. History of Atoms - Atoms and Molecules | Class 9th | CBSE | Chemistry | Chapter-3 (Maharishi Kanad)
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3. Laws of Chemical Combinations- Atoms and Molecules | Class 9 | CBSE | Chemistry | Chapter-3 -#sark21
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Is Matter Around us Pure?

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3. Compounds Homogeneous Heterogeneous Mixtures | Is Matter Around us Pure? Chemistry | Class 9th | CBSE
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4. SOLUTIONS | SUSPENSIONS | COLLOIDS | Is Matter Around us Pure? | Chemistry | Class 9th | CBSE | Ch-2
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6. Solubility and Numericals | Saturated and Unsaturated Solutions | Is Matter Around us Pure?| Ch-2
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8. Methods of Separation of mixture Part-1 | Is Matter Around us Pure?| Chemistry | Class 9 CBSE | Ch-2
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9. Methods of Separation of mixture Part-2 | Is Matter Around us Pure?| Chemistry | Class 9 CBSE | Ch-2
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