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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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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...
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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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Classes for competition exams by those who qualified these exams.

Sodium(Na)
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Chemistry Guru

CESIUM HAVING LOW MELTING POINT AND LIthium having high melting
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Tutor

I think option (d) because the atomic size is largest and you know larger the size of atom easy breaking down of its molecule due to lesss intra molecular force and its low or easy to melt.
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Cs
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