Chapter-3, 9th Class Atoms and Molecule, Subject Science
1. Name two scientists who established the laws of chemical combination? 2. Give an example of a triatomic molecule of an element. 3. Define atomicity. 4. Write the atomicity of the following molecules: (i) Sulphur (ii) Phosphorus 5. What is an ion? Give one example. 6. Write the cations and anions present (if any) in …
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