lanthanum 的定义
Chemistry.
- a rare-earth, trivalent, metallic element, allied to aluminum, found in certain minerals, as monazite. Symbol: La; atomic weight: 138.91; atomic number: 57; specific gravity: 6.15 at 20°C.
更多lanthanum例句
- Later in the decade, physicists began turning to other elements such as rubidium and lanthanum.
- By adding in another element, such as lanthanum or yttrium, scientists have created superconductors that function similar to the elusive metallic hydrogen, but at lower pressures.
- The chemical structure is similar to that of the 2018 superconductor made of lanthanum and hydrogen, where a cage of hydrogen atoms surrounds a lanthanum atom.
- A few years later, two groups, one led by Eremets and another involving Hemley and physicist Maddury Somayazulu, studied a high-pressure compound of lanthanum and hydrogen.
- Not to mention rare elements such as lanthanum, cerium, and neodymium, essential to modern technology and commanding high prices.
- Lanthanum sulphide, La2S3, is a yellow powder, obtained when the oxide is heated in the vapour of carbon bisulphide.
- Lanthanum hydroxide, La(OH)3, is a white amorphous powder formed by precipitating lanthanum salts by potassium hydroxide.
- Lanthanum, lan′tha-num, n. a metal discovered in 1839 in cerite, a hydrated silicate of cerium.
- During an absence of several days, the inventor left a mantle of lanthanum oxide locked up in his laboratory.
- Didymium, a rare metallic element, occurring along with lanthanum in the mineral cerite as discovered by Mosander in 1842.