BRAINCAKESuccessive Ionisation Energies
Successive ionisation energies increase because the remaining electrons are pulled closer to the nucleus after each electron is lost and the nuclear attraction on the remaining electrons increases.
The second ionisation energy is the energy required to remove one electron from each ion in one mole of gaseous 1+ ions of an element to form one mole of gaseous 2+ ions.
Mg+ → Mg2+ + 2e-
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Key terms in this lesson
- Ion
- A positively or negatively charged atom or group of atoms, formed by the loss or gain of electrons.
- 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.
- Mole
- The amount of substance that contains as many particles as there are atoms in exactly 12g of carbon-12.
- Period
- A horizontal row of the periodic table, containing elements with the same number of electron shells.
More in Periodicity
- The Periodic Table
- Electron Configuration
- Ionisation Energy
- Trends in First Ionisation Energies Across a Period
- Trends in First Ionisation Energies Down a Group
- Beryllium and Boron
- Nitrogen and Oxygen
- Metallic Bonding
All 14 lessons in Periodicity · All OCR AS-level Chemistry topics