Don't wonder which lobe the electron is in. The question has no answer because the electron is delocalized (smeared out); it's in both the lobes!
Copyright © 1997-2010 by Fred Senese
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Last Revised 02/23/18.URL: http://antoine.frostburg.edu/chem/senese/101/electrons/faq/print-how-electrons-cross-nodes.shtml