BRAINCAKENitrogen and Oxygen
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
- Ionisation
- The loss or gain of electrons by an atom or molecule to form a charged ion.
- Electron shell
- A main energy level occupied by electrons, given a principal quantum number n, with n = 1 closest to and lowest in energy relative to the nucleus.
- Sub-shell
- A subdivision of a main energy level (s, p, d or f) made up of orbitals of similar energy.
- First ionisation energy
- The energy needed to remove one electron from each atom of one mole of atoms in their gaseous state to form one mole of gaseous +1 ions, under standard conditions.
- Group
- A vertical column of the periodic table, containing elements with the same number of outer-shell electrons.
More in Periodicity
- Successive Ionisation Energies
- Trends in First Ionisation Energies Across a Period
- Trends in First Ionisation Energies Down a Group
- Beryllium and Boron
- Metallic Bonding
- Properties of Metals
- Giant Covalent Structures
- Diamond
All 14 lessons in Periodicity · All OCR AS-level Chemistry topics