So little is known about it, because there is only about 1 ATOM OF FRANCIUM IN A CUBIC FOOT OF URANIUM ORE!
对它所知甚,在1立方英的铀矿石,有1个钫原子!
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A lump of Plutonium, which is very radioactive, is really quite warm to touch. And francium, which I think is more radioactive, is probably very warm.
一块强的钚,起来真的。我认为更强的钫可能非常。
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