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Why not? Or, in other words, there's not really a "why" to explain here; it's an extension of a well-established trend (unlike Mercury, which is a liquid at room temperature while all the metals around it are solid and there's no such trend that would predict its dramatically lower melting point).

The trend for alkali metals is that they have lower melting points as you move down the table. By the time you get to caesium, it's only a little above room temperature, and the theoretical melting point for francium is even lower than that (but still slightly above room temperature).

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