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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.
What is melting point? Why can it be used as an index of purity? Melting point is one way of determining whether a substance is pure or not (Bodner Research Web, 2016). In determining the melting point, the range of temperature is the basis. This means the temperature at which the compound changes its state from solid to liquid.