64Gadolinio – GadoliniumMass: 157’25 uElectron configuration: [Xe] 4f75d16s2Melting point: 1585 K, 1312 °C, 2394 °FBoiling point: 3546 K, 3273 °C, 5923 °FDensity: 7.90 g·cm−3Discovery: 1880It is a silvery-white, malleable and ductile rare-earth metal. You can find it innature only in combined (salt) form. Gadolinium was first detected spectroscopicallyin 1880 by de Marignac who separated its oxide and is credited with its discovery. Itis named for gadolinite, one of the minerals in which it was found, in turn named forchemist Johan Gadolin. The metal was isolated by Paul Emile Lecoq de Boisbaudran in1886.