1. Introduction and basic guide

What is a molecule?

A molecule is a group of atoms bound together. It’s the next level of chemical complexity. Molecules represent the basic unit of a chemical compound, and this another of those essential basic chemistry concepts.

That’s basically it. An example is a water molecule, which is made from two atoms of hydrogen (H) and one atom of oxygen (O), held together via covalent bonds.

model for a water molecule
Models of a water molecule. Credit to Dbc334/Jynto via Wikipedia

Further definitions include, that they are the simplest fundamental unit that can take part in a chemical reaction, and that they are electrically neutral. This latter point distinguishes molecules from ions, another type of chemical compound.

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