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Chemical element
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==== States of matter ==== Another commonly used basic distinction among the elements is their [[state of matter]] (phase), whether [[solid]], [[liquid]], or [[gas]], at [[standard temperature and pressure]] (STP). Most elements are solids at STP, while several are gases. Only [[bromine]] and [[mercury (element)|mercury]] are liquid at 0 degrees Celsius (32 degrees Fahrenheit) and 1 atmosphere pressure; [[caesium]] and [[gallium]] are solid at that temperature, but melt at 28.4°C (83.2°F) and 29.8°C (85.6°F), respectively.
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