| 释义 |
eka-, prefix Chem.|ˈiːkə|
[a. Skr. eka one.]
Used 1872 in Ann. d. Chemie u. Pharmacie, VIII. Supplementband 196 by D. I. Mendeléeff (1834–1907), Russian chemist, to denote a predicted element that should occupy the next lower position to that so qualified in the same group in the periodic system.
1889Jrnl. Chem. Soc. LV. 648 Gallium, which proved to correspond to eka-aluminium of the periodic law..scandium, corresponding to eka-boron..and..germanium, which proved to correspond in all respects to eka-silicum. 1931Observer 18 Oct. 22/4 Eight years ago there were six [atomic] numbers corresponding to unknown elements... Both 43 and 75 were known before their discovery as eka-manganeses, from their anticipated similarity to manganese... 85 should be chemically akin to iodine, and so is provisionally called eka-iodine... On Friday the news came from America that eka-caesium had been discovered. 1938Ann. Reg. 1937 355 Curie & Savitich..obtained three new series of short period radioactive elements ending possibly in eka-gold, eka-iridium, and eka-rhenium. 1955Ann. Reg. 1954 398 It was announced in February that physicists of the University of California had produced element No. 99 provisionally called eka-holmium. 1969Daily Tel. 5 May 13/7 Russian scientists at Dubna and Leningrad are looking for element 114, eka-lead, in old mirrors made from lead glass. |