✒️— The nucleus is the positively charged centre of an atom and contains most of its mass. It is composed of protons, which have a positive charge, and neutrons, which have no charge. surrounding them are long-lived particles present in all ordinary, naturally occurring atoms.
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✒️— The nucleus is the positively charged centre of an atom and contains most of its mass. It is composed of protons, which have a positive charge, and neutrons, which have no charge.
surrounding them are long-lived particles present in all ordinary, naturally occurring atoms.
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