hafnium

名词 hafnium:

1. a grey tetravalent metallic element that resembles zirconium chemically and is found in zirconium minerals; used in filaments for its ready emission of electrons
   同义词：Hf, atomic number 72

haf.ni.um

n.Symbol Hf （名词）符号 Hf
A brilliant, silvery, metallic element separated from ores of zirconium and used in nuclear reactor control rods, as a getter for oxygen and nitrogen, and in the manufacture of tungsten filaments. Atomic number 72; atomic weight 78.49; melting point 2,220=C; boiling point 5,400=C; specific gravity 3.3; valence 4.See table at element
铪：一种锆矿中分离出来的亮银色金属元素，用于核反应堆的控制棒，可形成氧气和氮气的保护膜，还用于钨丝的制造。原子序数72；原子量78.49；熔点2,220=C；沸点5,400=C；比重3.3；原子价4参见 element

来源：
After Hafnia , Medieval Latin name for Copenhagen, Denmark
源自 哈夫尼尔 ，丹麦哥本哈根的中世纪拉丁名