BRAINCAKETrends in First Ionisation Energies Across a Period
There is a general increase in ionisation energy across a period.
There is a sharp decrease from the end of one period to the beginning of the next.
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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.
- Shielding
- The repulsion of the electron to be removed by the electrons in the inner shells, which reduces nuclear attraction.
- 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
- Successive Ionisation Energies
- 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