我们通常从植物中获取矿物质比如硒和铜。

We’d normally get minerals such as selenium and copper from plants.

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最近，一项针对硒和维生素E抗癌试验的报告显示，长期规律服用维生素E补充剂会增加健康男性患前列腺癌的风险。

A recent review of the Selenium and Vitamin E Cancer Prevention Trial showed long-term, regular use of Vitamin E supplements increase the risk of prostate cancer in healthy men.

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40年之后，美国发明家查尔士•弗里兹(Charles Fritts)用硒和薄金片制造出第一枚光能电池，发电效率低于1%。

About 40 years later Charles Fritts, an American inventor, built the first solar cell. Made with selenium and a thin layer of gold, the device was less than 1% efficient.

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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。

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