Ionisation Energies

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Ionisation Energies

Specification:

Define the terms first ionisation energy and successive ionisation energies

Explain that ionisation energies are influenced by nuclear charge, electron shielding and the distance of the outermost electron from the nucleus

Predict from successive ionisation energies of an element

the number of electrons in each shell of an atom

the group of the element

Factors effecting ionisation energies...

Nuclear charge

The greater the nuclear charge, the greater the attractive force on the outer electrons

Electron Shielding

Inner shells of electrons repel outer-shell electrons

This repelling effect is called electron shielding

The more inner shells there are, the larger the shielding effect and the smaller the nuclear attraction experienced by the outer electrons

Atomic Radius

The greater the atomic radius the smaller the nuclear attraction experienced by the outer electrons

Successive Ionisation Enegies