Ionisation energy depends onnuclear chargeshielding/ quantum shell and distance from nucleusthe orbitalAs we go across a period, the nuclear charge increases but the electrons are in the same quantum shell. Therefore the atomic radius decreases and the nuclear attraction is greater. As a result the first ionisation energy increases across the period
First Ionisation Energies
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Specification: Edexcel Chemistry (8CH0), AS-level, Topic 1: Atomic Structure and the Periodic Table. Topic: The Periodic Table.
Key terms in this lesson
- ionisation energy
- The energy needed to remove one electron from each atom in one mole of gaseous atoms, forming one mole of gaseous 1+ ions.
- shielding
- The repulsion of outer shell electrons by electrons in filled inner shells, which reduces the nuclear attraction they feel.
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