Technetium: Difference between revisions - Wikipedia

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===Early assumptions===

From the 1860s through 1871, early forms of the periodic table proposed by [[Dmitri Mendeleev]] contained a gap between [[molybdenum]] (element&nbsp;42) and [[ruthenium]] (element&nbsp;44). In 1871, Mendeleev predicted this missing element would occupy the empty place below [[manganese]] and have similar chemical properties. Mendeleev gave it the provisional name ''ekamanganeseeka-manganese'' (from ''eka''-, the [[Sanskrit]] word for ''one'') because the predicted elementit was one place down from the known element manganese.<ref>{{cite journal|doi = 10.1007/BF00837634|title = Technetium, the missing element|date = 1996|last1 = Jonge|journal = European Journal of Nuclear Medicine|volume = 23|pages = 336–44|pmid = 8599967|last2 = Pauwels|first2 = E. K.|issue = 3|s2cid = 24026249}}</ref>

=== Early misidentifications ===

Many early researchers, both before and after the periodic table was published, were eager to be the first to discover and name the missing element. Its location in the table suggested that it should be easier to find than other undiscovered elements. Still, many scientists got it wrong.

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