| − | An atom is the smallest unit chemical matter in creation. There have been many ideas about how atoms may look. The current one is called the [[Quantum Mechanical Model]], and is very complex. | + | An atom is the smallest unit chemical matter in creation. The word atom comes from the Greek term for indivisible, ''átomos''. There have been many ideas about how atoms may look. The current one is called the [[Quantum Mechanical Model]], and is very complex. |