What is the smallest unit of an element?

Which is one characteristic of some pure substances?

Which best describes an element?

Which is the best description of one particle of table salt? (NaCl)

When elements chemically combine, what do they form?

A substance contains 2 components joined by physical means. What best describes the substance?

An example of a homogeneous mixture is?

An example of a heterogeneous mixture is?

Which is an example of an element?

Which is a pure substance

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