BRAINCAKEAtomic Radii
Atomic radii are a measure of the size of atoms.
An atom does not have a well-defined boundary so the atomic radius is measured by measuring the distance between two adjacent nuclei and then dividing by 2.
The atomic radius of an element will depend on the type of bond that it forms.
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Key terms in this lesson
- Atomic orbital
- A region in space around the nucleus where there is a 95% probability of finding an electron of a given energy.
- Shielding
- The repulsion of outer electrons by electrons in inner shells, which reduces the net attraction of the nucleus for the outer electrons.
- Covalent bond
- A strong electrostatic attraction between a shared pair of electrons and the nuclei of the bonded atoms.
- 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
- First Ionisation Energy
- Group 2 and 3
- Group 5 and 6
- Successive Ionisation Energies
All 14 lessons in Periodicity · All AQA AS-level Chemistry topics