Question

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What is a molecule?
What is an atom?
What is an electron?

Answer 1

What is a molecule?

A molecule is an electrically neutral group of two or more atoms held together by chemical bonds.

What is an atom?

Is the basic unit of a chemical element.

What is an electron?

The electron is a subatomic particle, symbol   e−  or  β− , whose electric charge is negative one elementary charge.