Sources Used:
Many thanks to:
<http://www.micronmetals.com/97.htm>
<http://nobel.scas.bcit.bc.ca/resource/ptable/bk.htm>
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Heyes, S.J. "Survey of Actinide Oxidation States". Oxford Chemisty IT Centre. 1997-8. 23 Feb. 2000.
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<http://darkhelmet.scu.edu/martha/periodic/bak/97.html>
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<http://www.paydirt.net/files/paydirt/indu/Bk.stm>
<http://www.gwhs.phila.k12.pa.us/student/katya/bk.html>