Lanthanum
31lanthanum — Смотри Лантан (La) …
32lanthanum — n. (La) rare metallic element (Chemistry) …
33lanthanum — [ lanθənəm] noun the chemical element of atomic number 57, a silvery white rare earth metal. (Symbol: La) Origin C19: from Gk lanthanein escape notice (because it was long undetected in cerium oxide) + um …
34lanthanum — lan·tha·num …
35lanthanum — lan•tha•num [[t]ˈlæn θə nəm[/t]] n. chem. a rare earth, trivalent, metallic element, allied to aluminum, found in certain minerals, as monazite Symbol: La; at. wt.: 138.91; at. no.: 57; sp. gr.: 6.15 at 20°C. • Etymology: < NL (1841) < Gk… …
36lanthanum — /ˈlænθənəm/ (say lanthuhnuhm) noun a rare earth, trivalent, metallic element, allied to aluminium, found in certain rare minerals, as monazite. Symbol: La; relative atomic mass: 138.91; atomic number: 57; density: 6.17–6.19 at 20°C. {New Latin,… …
37lanthanum — n. Chem. a silvery metallic element of the lanthanide series which occurs naturally and is used in the manufacture of alloys. Usage: Symb.: La. Etymology: Gk lanthano escape notice, from having remained undetected in cerium oxide …
38Isotopes of lanthanum — Naturally occurring lanthanum (La) is composed of one stable (139La) and one radioactive (138La) isotope, with the stable isotope, 139La, being the most abundant (99.91% natural abundance). 38 radioisotopes have been characterized with the most… …
39La — • lanthanum …
40Cerium — lanthanum ← cerium → praseodymium ↑ Ce ↓ Th …
