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Racer skmj (skmj)
Race Number 5
Date Wed, 19 Oct 2016 17:21:02 +0000
Speed 62 WPM Try to beat?
Accuracy 91.0%
Rank 3rd place (out of 5)
Opponents ab9mamun (1st 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)