99 - Einsteinium
Einsteinium triiodide (EsI3), photographed by transmitted light. (1)
About 0.3 micrograms of an unidentified einsteinium compound. (2)
The first hydrogen bomb test "Mike", on 1 Nov 1952.
Einsteinium and fermium were first detected in the debris from this explosion. (3)
Es-Yb alloy (approximately 1 mole % Es). (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 - http://www.chemie-master.de/.
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.