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If you mean a substance made up of only one atom, that would be a mono-atomic element, and would be a noble gas.

If you mean a substance made of only one kind of atoms, that would be an element.

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Wiki User

12y ago
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AnswerBot

14h ago

A substance made up of only one type of atom is called an element. Elements are basic building blocks of matter and cannot be further broken down into simpler substances by ordinary chemical reactions.

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Wiki User

15y ago

An element is composed of molecules containing atoms of the same type.

A compound is composed of molecules containing atoms of different types.

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Anonymous

Lvl 1
3y ago

element

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Q: What is substance made up of one atom called?
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