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Which of the alkali metal is having least melting point? (a) Na (b) K (c ) Rb (d) Cs |
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Answer» Solution : Atomic size increases as we move down the alkali group. As a result, the BINDING energies of their atoms in the crystal lattice decrease. Also, the strength of metallic bonds DECREASES on MOVING down a group in the periodic table. This CAUSES a decrease in the melting point. Among the given metals, Cs is the LARGEST and has the least melting point. |
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