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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.
The attractive forces are strong enough to hold the molecules close. But the molecules have enough kinetic energy to slide past each other, so bromine condenses to a liquid. In iodine, the electrons are so far from the nuclei that the electron clouds can easily distort. The London dispersion forces are strong.