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- 27. (1) atomic number : atomic number of an element is equal to the number of protons present in the nucleus of its atom
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- 25 ans -According to science atom is the smallest unit of an element that can or cannot exist freely. While on the other hand, a molecule is a set of atoms that are held together with the help of a bond and is the smallest unit of a compound. Furthermore, an atom can or cannot exist in a free state.
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