A molecule is an electrically neutral group of one or two atoms held together by chemical bonds.
When atoms combine they form something called molecules. Technically it’s two or more atoms that are combined together that are electrically neutral. Depending on whether the study is of chemistry or physics, the study is called mocleular chemistry or molecular physics.
Common molecules are things you may have seen every day, and not thought of as molecules. Some of these common things may be air, water, alcohol, sugar, petrol or gasoline.
The shape of a molecule is sometimes referred to as it’s structure. As polyatomic molecules get bigger, such as six or more atoms.