Science Class 9 Notes – Atoms and Molecules
[The molecules of an element is made up of only one and same type of atoms, while the molecule of a compound is made up of dissimilar atoms] 7. Atomicity : The number of atoms present in a molecule of an element or a compound is known as its atomicity. e.g. the atomicity of oxygen is 2 while atomicity ozone is 3. 8. Ion :
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