The typical size of atoms and small molecules is around 1 × 10-10 m (0.1 nm). For example: diameter of a hydrogen atom, H 1.0 × 10-10 m width of a hydrogen molecule, H 2 2.9 × 10-10 m ...

Here, the oxygen atom is red, carbon is black and hydrogen is white. Image caption, A ball-and-stick model of methane Molecules can be drawn in different ways. In this diagram of methane (CH₄ ...