98 - Californium
Green crystal of californium bromide CfBr3. (1)
About 20 micrograms as a circular spot plated on a platinum disk. (2)
The first pure californium compound, 0.3 micrograms of californium-249 oxychloride (CfOCl), isolated in 1960.
The crystals are lodged in a capillary tube. (3)
Californium metal (5 mg of Cf-249). (4)
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http://www.chemie-master.de/. Photo credited to A. Kronenberg,
2 - "Matter", Ralph E. Lapp and the editors of LIFE, LIFE Science Library. A newer edition than 1965, I don't know which year.
3 - "Man-Made Transuranium Elements", G. T. Seaborg, Prentice-Hall, 1963. The 1965 Life book also used this picture.
4 - R. G. Haire, "Preparation of transplutonium metals and compounds", p 309-342, printed in "Actinides in Perspective", N.M. Edelstein ed., Pergamon Press, 1981. Thanks to David Keim for the reference.
5 - In J. Emsley, "Nature's Building Blocks", Oxford Press, 2001, it is stated that californium metal has yet to be prepared. This appears to be incorrect.
6 - An Application by Kodak in analysis of impurities in chemicals.