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For questions about the atomic radius - a measure of the size of an atom, usually the mean or typical distance from the center of the nucleus to the boundary of the surrounding "cloud" of electrons.

Atomic radius is the measure of the size of an atom, usually the mean or typical distance from the center of the nucleus to the boundary of the surrounding "cloud" of electrons. Atomic radius are of three types:

  1. Ionic radius - for ionic species like $\ce{NaCl}$
  2. Covalent radius - for species like $\ce{Cl2}$
  3. van der Waal's radius - for non-bonding species like neon

In each case, the radius is defined as half of the distance of the two atoms/ions. In the third case, it is actually half the closest distance of approach, since the atoms don't bond with each other.

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