Se Selenium 34 78.96 16 4 p 34 217.0 685.0 [Ar] 4s2 3d10 4p4 2 8 18 6 4.79 5E-6% Gray Hexagonal 2.6 2.424 {"1":"941.0","2":"2045","3":"2973.7","4":"4144","5":"6590","6":"7880","7":"14990"} 941 195 116 +4,-2,+6 1.4 16.5 5.54 26.32 0.32 2.04 0 Solid, Diamagnetic, Stable, Natural, Nonmetal si-LEE-ni-em Soft metalloid similar to sulfur. Ranges from gray metallic to red glassy appearance. Light causes it to conduct electricity more easily. It is used in photoelectric cells, TV cameras, xerography machines and as a semiconductor in solar batteries and rectifiers. Also colors glass red. Obtained from lead, copper and nickel refining. Conducts electricity when struck by light. IHrUtKjcAFE Selenium

Vanadium was originally discovered by Andrés Manuel del Río in 1801.

In 1805, the French chemist Hippolyte Victor Collet-Descotils incorrectly declared that del Río's new element was only an impure sample of chromium.

In 1831, the Swedish chemist Nils Gabriel Sefström rediscovered the element in a new oxide he found while working with iron ores.

Later that same year, Friedrich Wöhler confirmed del Río's earlier work. Named after Scandinavian goddess, Vanadis 34 1817 Jöns Berzelius Sweden From the Greek word "selene" meaning "moon"

All vanadium compounds should be considered toxic

Vanadium is mined mostly in South Africa, north-western China, and eastern Russia

Vanadium is used as an additive in steel to strengthen and protect against corrosion.

Titanium-aluminum-vanadium alloy is used in jet engines and for high-speed aircraft.

Vanadium foil is used in cladding titanium to steel.

Vanadium pentoxide is used in ceramics and as a catalyst for the production of sulfuric acid.