Multiple choice

Which of the following factors does not affect ionisation potential?

  1. The shielding or screening effect of inner shells

  2. Type of electrons involved

  3. Completely filled or half filled sub-shells

  4. Electron affinity
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The electron affinity (EA) of an element is defined as the energy given off when a neutral atom in the gas phase gains an extra electron to form a negatively charged ion. Electron affinities are more difficult to measure than ionisation energies and are usually less accurately known. Electron affinities are large and negative for elements such as fluorine and oxygen, and small and positive for metals.

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