Students will have seen signs of electrons and positive ions (perhaps carrying a current through ionized neon or helium). On...

Teaching Guidance 14-16

As students start experiments on ionisation, they will have a fairly basic model of atoms and molecules as portrayed by the...

Teaching Guidance 14-16

This is an historic experiment which is often presented to students with little context. It is suggested that, in 1910, the...

Physics Narrative 14-16