What we'll study

  • Definition and explanation∅
  • Types
    • Van der Waals Radius
    • Ionic Radius∅
    • Covalent Radius∅
    • Metallic Radius∅
    • Bohr Radius∅
  • Periodic Trends∅

The atomic radius of a chemical element is a measure of the size of its atoms. It is the mean distance from the centre of the nucleus to the boundary electron cloud. Since the boundary is not well defined, we have some different atomic radii definitions quite different from each other.

Types of Atomic RadiiEdit

Van der waals RadiusEdit

Definition:It is half the minimum distance between the nuclei of two atoms of the element that are not bound to the same molecule.

The van der Waals radius, rw, of an atom is the radius of an imaginary hard sphere which can be used to model the atom for many purposes. It is named after Johannes Diderik van der Waals, winner of the 1910 Nobel Prize in Physics, as he was the first to recognise that atoms were not simply points and to demonstrate the physical consequences of their size through the van der Waals equation of state.

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