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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.
Phases of Acetone and Diphenyl at room temp. Sep 16, 2012 #1. I was reviewing a chart of Physical properties of pure substances (20 Â°C) Acetone has a melting point of -95Â°C and boiling point of 56Â°C so you'd assume it's solid (but obvioulsy it's liquid). In addition, Diphenyl has a melting point of 70Â°C and boiling point of 255Â°C so you'd assume it's liquid (but it's solid).