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atoms Composite particles of protons, neutrons and electrons. The smallest part of a substance that can take part in a chemical reaction. Click here for more information.
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atomsThe smallest component of an element or ‘matter’ having the chemical properties of the element.
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atomsmade up of protons and neutrons in a central nucleus surrounded by electrons. The smallest particle of a chemical element that can take part in a chemical reaction without being permanently changed.
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