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In fact, hydrogen (which is a gas at room temperature) is not included in the alkali metals, even though it is located in Group 1 on the periodic table. For the metals in this group, the melting and boiling temperatures decrease with increasing atomic number.
Bromine (symbol Br and atomic number 35) and mercury (symbol Hg and atomic number 80) are both liquids at room temperature. Bromine is a reddish-brown liquid, with a melting point of 265.9 K. Mercury is a toxic shiny silvery metal, with a melting point of 234.32 K. Elements That Become Liquid 25Â°C-40Â°C When the temperature is slightly warmer, there are a few other elements found as liquids at normal pressure: 1  Francium. 2  Cesium. 3  Gallium. 4  Rubidium.