<span>The two techniques for separating an insoluble solid from a liquid are filtration and centrifuging. Filtration relies on the fact that the solid particles are smaller than the filter paper pores which allow the tiny molecules of liquid to pass through. With solids which dissolve in a liquid solvent, evaporation is commonly used to recover the solid and distillation is used to recover the solvent.</span>
Answer: Fluorine and chlorine are gases. Bromine is one of only two liquid elements, and iodine is a solid.
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The U.S. Federal Communications Commission (FCC)
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