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Bromine's formula is Br2 (the two is a subscript), no matter what state of matter. This is because it is a diatomic element. All diatomic elements don't like being "lonely", so it will pair up with another one of itself. Bromine (Br), Iodine (I), Nitrogen(N), Chlorine (Cl), Hydrogen (H), Oxygen(O), and Fluorine(F) are the diatomic elements. (A good way to remember those is BrINClHOF- try saying it.)

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12y ago

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