One of the simplest or essential parts or principles of which anything consists, or upon which the constitution or fundamental powers of anything are based.: Any one of the types of atom distinguished by having a certain number of protons in its nucleus.
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Example
Hydrogen is the first element in the periodic table. It is the simplest possible atom composed of one proton in the nucleus which is orbited by a single electron.
Order number
2
Part of speech
noun
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