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What will most likely happen when two bromine atoms bond together?

Which element has the lowest electronegativity? calcium(ca) gallium(ga) selenium(se) bromine(br)

How is it possible for someone to put an ear to a wall and hear someone in the next room?     a.sound waves can travel though solids.    b.the waves travel from room to room via air.    c.there must be some air in the wall so the sound can travel through it.    d.sound waves change to electromagnetic waves and then back again.