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transition elements

(Encyclopedia)transition elements or transition metals, in chemistry, group of elements characterized by the filling of an inner d electron orbital as atomic number increases. This includes the elements from titani...

Erlenmeyer, Richard A. C. E.

(Encyclopedia)Erlenmeyer, Richard A. C. E. ĕrˈlənmīˌər [key], 1825–1909, German chemist. He studied at Giessen under Justus von Liebig and at Heidelberg under Friedrich Kekulé, both German chemists. Erlenm...

Frankland, Sir Edward

(Encyclopedia)Frankland, Sir Edward, 1825–99, English chemist. He studied under Bunsen and Liebig and taught at several English institutions. In working on the synthesis and isolation of compounds he evolved the ...

equivalent weight

(Encyclopedia)equivalent weight. The equivalent weight of an element or radical is equal to its atomic weight or formula weight divided by the valence it assumes in compounds. The unit of equivalent weight is the a...

In

(Encyclopedia)In, symbol for the element indium. ...

copper sulfate

(Encyclopedia)copper sulfate, common name for the blue crystalline heptahydrate of cupric sulfate, in which copper has valence +2. It may also refer to cuprous sulfate (Cu2SO4), in which copper has valence +1. ...

oxidation number

(Encyclopedia)oxidation number or oxidation state: see valence. ...

cupric

(Encyclopedia)cupric kyo͞oˈprĭk [key], copper in the +2 valence state. ...

cuprous

(Encyclopedia)cuprous kyo͞oˈprəs [key], copper in the +1 valence state. ...

ferric

(Encyclopedia)ferric fĕrˈĭk [key], iron in the +3 valence state. ...