IE graph(s)

IB Chemistry: IE graph(s)

Explaining the shapes of ionization energy graphs tends to be more of a problem at Standard Level than Higher Level. This is mainly because the best explanation involves sub-levels and although ionization energies provide evidence for sub-levels the trends are only really mentioned in the AHL sub-topic 12.1: Electrons in atoms. Even so, Higher Level students also often show some misunderstanding of the basic principles.

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