硒是一种化学元素,化学符号是Se,在化学元素周期表中位于第四周期VI A族(第34号元素),是一种非金属。可以用作光敏材料、电解锰行业催化剂、动物体必需的营养元素和植物有益的营养元素等。硒在自然界的存在方式分为两种:无机硒和植物活性硒。无机硒一般指亚硒酸钠和硒酸钠,从金属矿藏的副产品中获得;后者是硒通过生物转化与氨基酸结合而成,一般以硒蛋氨酸的形式存在。
例如,人们以前认为铟的原子质量介于砷和硒之间。
Indium, for example, had previously been assigned an atomic mass between those of arsenic and selenium.
这事情多奇怪啊,人类——不,亚硒人怎么有时会想到这么奇怪的事情啊!
What strange things men—no, what strange things Selenites sometimes take into their heads!
南瓜籽富含蛋白质,锌,镁和硒,有助于预防抑郁症和心脏病。
Packed with protein, zinc, magnesium, and selenium, pumpkinseeds help protect against depression and heart disease.
So, selenium 2 minus is what's going to be isoelectronic, because if you add two electrons to selenium, you'll get the same electron configuration that you have for krypton here.
负二价的硒离子将是等电子的,因为如果你给硒原子加上两个电子,你会得到,和氪原子相同的电子排布。
So, we need to fill our octet for selenium, so 1, 2, 3, 4.So, this is our Lewis structure here, hopefully you can see why it's not linear.
我们要填满硒原子的八配位,所以1,2,3,4。这就是Lewis结构,希望你们能看出来为什么它不是直线型的。
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