I forgot (sammuelp1399)

Race #2969

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Official speed 87.69 wpm (53.92 seconds elapsed during race)
Race Start May 1, 2014 12:01:27am UTC
Race Finish May 1, 2014 12:02:21am UTC
Outcome Win (1 of 2)
Accuracy 90.0%
Points 0.00
Text #105 (Length: 394 characters)

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.