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The melting points of metals depend mainly on the strength of metallic bonding, crystal structure, atomic size, and the number of valence electrons available for metallic bonding. The trends shown by alkali metals, alkaline earth metals and transition metals are different because the nature and strength of their metallic bonding differ considerably. Alkali metals belong to Group 1 and have one valence electron. In the fourth, fifth and sixth periods, the relevant alkali metals are potassium (K), rubidium (Rb) and caesium (Cs), respectively. Their melting points generally decrease down the group. Potassium melts at ______ ________ ___ ____ ____ __________ __________ ________.
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