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词汇 selenium
释义 se·le·ni·um AHD[sĭ-lēʹnē-əm] D.J.[sɪˈliːniːəm]K.K.[sɪˈliniəm]n.Symbol Se (名词)符号 Se
  1. A nonmetallic element, red in powder form, black in vitreous form, and metallic gray in crystalline form, resembling sulfur and obtained primarily as a byproduct of electrolytic copper refining. It is widely used in rectifiers, as a semiconductor, and in xerography. Its photovoltaic and photoconductive actions make it useful in photocells, photographic exposure meters, and solar cells. Atomic number 34; atomic weight 78.96; melting point (of gray selenium) 217°C; boiling point (gray) 684.9°C; specific gravity (gray) 4.79; (vitreous) 4.28; valence 2, 4, or 6. See table at element 硒:一种非金属元素,粉末状时呈红色,玻璃状时呈黑色,结晶状时呈金属般的灰色,与硫类似,通常作为副产品在电解法冶炼铜时获得。广泛地用于整流器(如半导体)和静电复印术中。其光电压的和光电导的效应使它可在光电池、照相曝光表和太阳能电池中发挥作用。原子序数34;原子量78.96;(灰色硒的)熔点217°C;沸点(灰色硒的)684.9°C;(灰色硒的)比重4.79;(玻璃状的硒)比重4.28;化合价2,4或6 参见 element
Etymology语源
    1. Greek selēnē [moon] from selas [light, brightness] 希腊语 selēnē [月亮] 源自 selas [光,亮光,明亮]
    1. -ium -ium
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