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So, iron has a melting point greater than room temperature due to the fact that metals are made up of giant structures of atoms in a regular arrangement, and there are strong forces of electrostatic attraction between positive metal ions and negative electrons, meaning that a lot of heat energy is required to break the bonds, i.e. a very high ...
Two elements are liquid at room temperature (298 K): Bromine (Br), an reddish brown liquid witha suffocating odor, melts at 265.9 K. Mercury (Hg), a toxic metal, melts at 234.32 K. (See Why is mercury a liquid at STP?) Four elements melt just a few degrees above room temperature. Francium (Fr) , a radioactive and extremely reactive metal, melts around 300 K. The false color image at left shows 10,000 francium atoms in a laser trap.