Question

What classifies a substance as an element?

Answer 1

Elements cannot be broken down into simpler substances by any or series of chemical reactions.

A compound can be broken done by chemical reactions

Element and compound

An element can be defined as species of atoms having a certain number of protons in their nuclei and pure substance of that species.  

Elements cannot be broken down into simpler substances by any or series of chemical reactions.

A compound can be defined as a chemical substance  that is composed of numerous identical molecules containing atoms from more than one element and held together by chemical bonds.

A compound can be broken done by chemical reactions

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