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Hace 10 horas · Maria Theresa (Maria Theresia Walburga Amalia Christina; 13 May 1717 – 29 November 1780) was ruler of the Habsburg dominions from 1740 until her death in 1780, and the only woman to hold the position suo jure (in her own right). She was the sovereign of Austria, Hungary, Croatia, Bohemia, Transylvania, Mantua, Milan, Galicia and Lodomeria, the Austrian Netherlands, and Parma.
Hace 10 horas · Vanadium is a chemical element; it has symbol V and atomic number 23. It is a hard, silvery-grey, malleable transition metal. The elemental metal is rarely found in nature, but once isolated artificially, the formation of an oxide layer ( passivation) somewhat stabilizes the free metal against further oxidation .
