La Lanthanum 57 138.90547 3 6 f 57 920.0 3454.0 [Xe] 5d1 6s2 2 8 18 18 9 2 6.15 0.0034% Silver Hexagonal 1.1 {"1":"538.1","2":"1067","3":"1850.3","4":"4819","5":"5940"} 538 48 169 3 1.38 22.5 11.3 399.57 0.19 13.5 0 Solid, Conductor, Lanthanide, Stable, Natural LAN-the-nem Soft, silvery-white, malleable, ductile metal. It is used in the electodes of high-intensity, carbon-arc lights. Also used in the production of high-grade europium metal. Because it gives glass refractive properties, it is used in expensive camera lenses. Found with rare earths in monazite and bastnasite. Monazite sand typicall contains 25% lanthanum. Q21clW0s0B8 Lanthanum

Jędrzej Śniadecki isolated the element in 1807, but his work was not ratified.

Jöns Berzelius and Gottfried Osann nearly discovered ruthenium in 1827.

In 1844, Karl Ernst Claus confirmed that there was a new element and isolated ruthenium from the platinum residues of the rouble production while he was working in Kazan University, Kazan. From the Latin word Ruthenia, Russia 57 1839 Carl Gustaf Mosander Sweden From the Greek word "lanthanein" meaning "to lie hidden"

Ruthenium is a suspected carcinogen and its compounds strongly stain the skin

Ruthenium is unaffected by air, water and acids

Ruthenium is used in platinum and palladium alloys to make wear-resistant electrical contacts.

Ruthenium dioxide and lead and bismuth ruthenates are used in thick-film chip resistors.

Fountain pen nibs are frequently tipped with alloys containing ruthenium.

Ruthenium is a versatile catalyst.