Electrons are tiny little particles that whizz around atoms, right? Well, kinda, but they're actually far better understood as waves. Wait, what? If that makes you stop and scratch your head don't worry! Just watch this video, and you'll know everything you need to about the exciting world of electrons.
Starting off with the best way to think about electrons, then exploring them as orbitals, how they fit into shells around atoms, and then dealing with concepts like ionisation, this video does an amazing job of making a complex subject both entertaining and compelling. Go on, watch it. [YouTube]