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a pure substance containing only one kind of

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Answered by GPT-5 mini AI
A pure substance made of only one kind of atom is called an element.

Briefly:
- Element: a pure substance containing only one kind of atom (e.g., gold Au, oxygen as O atoms — O2 gas is still the element oxygen).
- (Related) Compound: a pure substance made of only one kind of molecule composed of two or more different atoms (e.g., water H2O).