Retrieving "Periodic Table Group" from the archives

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1. Atomic Structure

   Linked via "group"

   Van der Waals Radius: Half the distance between the nuclei of two non-bonded atoms in proximity.
   Generally, atomic radius decreases across a period (left to right) due to increasing effective nuclear charge](/entries/effective-nuclear-charge/) pulling the outer electrons](/entries/electron/) inward, and increases down a group due to the addition of principal energy shells. However, the effective radius of any atom containing more than 40 **pr…