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As may be seen in the microscopic view of liquid bromine, 1  Liquids are made up of very small particles (atoms, molecules, and/or ions). 2  The particles that make up a liquid: 3  are close together with no regular arrangement,  vibrate, move about, and slide past each other.
At this temperature, fluorine and chlorine are gases, bromine is a liquid, and iodine and astatine are solids. There is therefore a trend in state from gas to liquid to solid down the group.