why is sodium’s melting point higher than rubidium’s?

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  • 3 weeks ago

    The melting points get lower going down the Alkali Metals group with an increase in atomic number. The radius of atoms in the group gets larger as you go down, we can say that the strength/force of holding them together is more dispersed over a larger area implying that the metals are going to be more weakly bonded. Therefore since the element rubidium is lower than the element sodium in the group and because rubidium's atomic number is higher than sodium's, sodium's melting point is higher than rubidium's. 

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