Mendeleev's predicted elements

The prefix eka- (from Sanskrit eka "one" ) was used to identify undiscovered chemical elements in the periodic table.

An element then got the name of an already known element together with the prefix eka if it was a period below which. The Russian chemist Dmitri Mendeleev in 1871 said, requires the existence of three elements, because these would fill the corresponding gaps in his periodic table. For this reason, "invented" the prefix eka and he named these elements Ekasilizium, Ekaaluminium and Ekabor according to the known element closest to them standing.

• Ekaaluminium discovered in 1875 by Paul Emile Lecoq de Boisbaudran and after his native France (lat. gallia ) Gallium called.
• Ekabor Lars Fredrik Nilson discovered in 1879 by, and named after his native Scandinavia scandium.
• Ekasilizium discovered in 1886 by Clemens Winkler and after his home country Germany (lat. germania ) called germanium.

Today, instead of prefixes Eka and Dwi systematic element names are used according to the atomic number of not yet named items.

• Chemical element
• Prefix