Fluorine will be a solid at any temperature less than its melting point of –220oC. At –220oC, fluorine melts and becomes a liquid. The liquid then heats up until it reaches the boiling point of –188oC. At that temperature, the fluorine becomes a gas and remains a gas for all higher temperatures. Which of the halogens are gases at room temperature of 22oC? Which are liquids? Which are solids?

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Answerd. may include all of these are many definitions of bases: the  brønsted-lowry definition of acids and bases says that bases are proton acceptors.the arrhenius definition of acids and bases says that bases increase [oh⁻] in solution (thereby producing oh⁻ ions)the lewis definition of acids and bases says that bases donate electron pairs.therefore, the sensible answer is that a base may include all of the described characteristics.