Structure of Atom

Things to remember

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• The mass of sub-atomic particles is very small.
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• The mass of these particles cannot be expressed in gram.
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• The electrons is a negatively charged particle found in the atom of all the elements.
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• Electrons are located outside the nucleus in an atom.
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• The proton is a positively charged particle found inside the nucleus of atoms of all the elements.
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• The neutron is a neutral particle found in the nucleus of an atom.
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