The Chemical and Radioactive Properties of the Heavy Elements. Glenn T. Seaborg. Chemical Engineering News. Vol. 23 (10 December 1945): 2190–2193. Wartime acceleration in the study of the heavy elements above No. 88, which form a transition series of the rare earth type, has removed them from the unfamiliar. The discovery of elements 95 and 96, of a new isotope of neptunium, of the occurrence of plutonium in nature, and its large-scale production at Hanford, are outlined.
New Elements Einsteinium and Fermium, Atomic Numbers 99 and 100. Ghiorso, A.; Thompson, S. G.; Higgins, G. H.; Seaborg, G. T.; Studier, M. H.; Fields, P. R.; Fried, S. M.; Diamond, H.; Mech, J. F.; Pyle, G. L.; Huizenga, J. R.; Hirsch, A.; Manning, W. M.; Browne, C. I.; Smith, H. L.; Spence, R. W. Physical Review. Vol. 99 No. 3 (1 August 1955): 1048–1049.
$500,000 of Calcium. Periodic Videos. YouTube (2017). The rare isotope calcium 48 plays a key role in the creation of superheavy elements. But it's not easy to obtain. Filmed at the Joint Institute for Nuclear Research, in Dubna, Russia.