Write down two characteristics of an atom.
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- Basic unit of a chemical element; smallest unit of matter; extremely small.
- Central and most important part of an atom; positively charged center of an atom, containing most of its mass. Stable subatomic particle occuring in all atomic nuclei; with a positive electric charge.
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(i) An atom is the smallest particle of an element.
(ii) An atom is electrically neutral.
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