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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1 - http://www.chemie-master.de/.  Photo credited to A. Kronenberg, http://www.kernchemie.de/.
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.