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Francium is the densest of the Alkali Metals and also radioactive.

钫是碱密度大的,有射性。

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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.

一块放射钚，起来暖和。我认为放射更钫可能非常暖和。

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