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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,为在1立方英的铀矿石中,有1钫原子!

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3G, 401(K), a,

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趣味验：Periodic Videos

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.

一块很强的钚，起来真的很暖和。我认为更强的钫可能非常暖和。

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3G, 401(K), a,
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