Risparmia con i nostri partners! Siamo un gruppo di appassionati viaggiatori. Che ha deciso di condividere le proprie esperienze e conoscenze, per permettere a chiunque voglia viaggiare negli Stati Uniti di farlo nel modo migliore. Noi sappiamo che il modo mig.

Group of chemical elements - Curium. In which the first letter C. Is the initial of Curie and m. Is the initial of Marie. Does not have stable isotopes. 15 isotopes with mass numbers from 237 to 251 are currently known. The most long-lived of them are.

Element Hafnium, Hf, Transition Metal. In 1911 Urbain noticed several new lines in spectrum of the fractions of yttria mother solution and, thinking he had found a new element similar to the rare earths, called it celtium.

Element Lanthanum, La, Lanthanide. Lanthanum is a tin-white metal of density 6. It is malleable, but not ductile. Measurements made with material of doubtful purity indicate that lanthanum is feebly paramagnetic, but this is questionable. 923 and its heat of formation 97. it resembles the corresponding cerium compound.