What is an element. give three examples

Hi there,

An element is a substance whose atoms have the same number of protons.

Examples include: oxygen, hydrogen and sodium, chlorine, lead and iron.

Hope this helped :)

Have a great day

why do the isotopes of a particular element behave differently in nuclear reactions but the same in chemical reactions? chemical reactions involve changes to electrons in an atom; isotopes do not differ in electrons, and so they react the same way during chemical changes.

the answer to your question is c.

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