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Racer 4b786NI4Us (laurier001)
Race Number 1237
Date Thu, 15 May 2014 19:57:09 +0000
Speed 67 WPM Try to beat?
Accuracy 92.5%
Rank 1st place (out of 4)
Opponents maderwc (3rd place)

Text typed:

The treatment of atoms with more than one electron requires consideration of the effects of interelectronic repulsion, orbital penetration towards the nuclear shielding, and an extra quantum number which specifies the intrinsic energy of the electron in any orbital. All these considerations are necessary to allow construction of the modern form of the periodic classification of the elements.
Structure and Bonding (Basic Concepts in Chemistry) (book) by Jack Barrett (see stats)