zir.co.ni.um
n.Symbol Zr （名词）符号 Zr A lustrous, grayish-white, strong, ductile metallic element obtained primarily from zircon and used chiefly in ceramic and refractory compounds, as an alloying agent, and in nuclear reactors as a highly corrosion-resistant alloy. Atomic number 40; atomic weight 9.22; melting point ,852=C; boiling point 3,578=C; specific gravity '.5' (20=C); valence 2, 3, 4.See table at element 锆：一种有光泽的、坚固的、可伸展的灰白色金属元素，主要从锆石中提炼。作为合金剂在陶器制造和耐火化合物中大量使用，而在核反应器中用作一种高度抗腐蚀合金。原子序数40；原子量9.22；熔点,852=C；沸点3,578=C；比重'.5'（在20=C时）；化合价2,3,4参见 element
