BRAINCAKEGroup 5 and 6
Although there is a general trend and the first ionisation energy increases across a period, the first ionisation energy falls from nitrogen to oxygen.
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Key terms in this lesson
- Sub-shell
- A subdivision of a main energy level (s, p, d or f) containing orbitals of similar energy.
- First ionisation energy
- The enthalpy change when each atom in one mole of gaseous atoms loses one electron to form one mole of gaseous 1+ ions.
- Group
- A vertical column of the periodic table, containing elements with the same number of outer-shell electrons.
- Period
- A horizontal row of the periodic table, containing elements with the same number of electron shells.
More in Periodicity
- Reactivity
- Hydrogen and Helium
- Periodicity and Period 3 Elements
- Trends in Melting and Boiling Points
- Atomic Radii
- First Ionisation Energy
- Group 2 and 3
- Successive Ionisation Energies
All 14 lessons in Periodicity · All AQA AS-level Chemistry topics