Atom
A neutral particle: as many electrons as protons. Written as a symbol on its own, with no charge: , , .
7 min
Atoms, molecules and ions
Three words that get mixed up: tell them apart at a glance from a formula, and know where an ion's charge comes from.
The essentials
2
Molecule
Members only
3
Ion
Members only
4
Polyatomic ions
Members only