IB Chemistry 3.1.3 Periodicity Questions
IB Chemistry 3.1.3 Periodicity Questions
Explain periodicity with the exact ideas examiners reward: shell distance, shielding, nuclear charge and subshell differences in ionization energy.
How this is tested
- explain why first IE falls down Group 15: more shells and shielding weaken nuclear attraction
- explain Li->Be rise but Be->B drop: B loses a higher-energy 2p electron, not a 2s electron
- order Ge4+, Ge2+, Ge and Ge4- by radius from smallest to largest using charge and electron count