ANSWERS: 4
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It's probably has something to do with it's density.
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Somebody has to!
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Each atom of lead has a lot of protons and neutrons in its nucleus -- they are mainly responsible for the mass of the atom, so lead metal is quite dense.
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Because if it wasn't it'd mess up the saying 'dropped like a lead balloon'... & possibly others, I dunno I’m no phrase-book.
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