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Why
Just why?
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Heavily explosive alkali metal. The outer electron, which every alkali metal has, is way farther than the others of the group in francium, as the atom is enormous. The seperation of this electron gives away a lot of heat in all alkali metals. In the larger ones, as the force between the electron and the nucleus is less. This makes the electron seperate way faster than lithium and sodium and other lighter alkali metals. It's reaction with water releases hydrogen gas. The heat released from the seperation of the electron ignites the hydrogen.
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