Molecules

When 2 or more atoms coalesce, they are called molecules.

They may either be of the same kind of atom, such as an Oxygen molecule (O₂), made of 2 Oxygen atoms, or

are made from different elements (atoms) such as H₂O (2 Hydrogen and 1 Oxygen atoms) 

An interesting point about molecules is that when they bond:

A) the atoms share their electrons, and

B) they prefer to have their shells filled.

The electron, if moving from 1 shell to another (either it's own, or when bonding with other atoms to make molecules), will jump - make a 'quantum leap' - and immediately appear on the next shell, without moving through the space in between shells.

THE BIG QUESTION IS - HOW DID NON-LIVING THINGS TURN INTO - LIVING THINGS

Electric motor made from a single molecule

http://www.bbc.co.uk/news/science-environment-14763223