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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.
475. 1) The melting point of a solid is the temperature at which it changes state from solid to liquid. 2) Heat of fusion is the thermal energy which must be withdrawn to solidify a certain mass or quantity of liquid or added to melt a certain mass or quantity of solid.) The melting point of a solid is the temperature at which it changes state from solid to liquid. 2) Heat of fusion is the thermal energy which must be withdrawn to solidify a certain mass or quantity of liquid or added to melt a certain mass or quantity of solid.