Which of the alkali metal is having least melting point?

(a) Na (b) K (c) Rb (d) Cs

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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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The alkali metals are low melting . Which of the following alkali metal is expected to melt if the room temperature rises to $30^{\circ}$ C?
(a) Na (b) K (c) Rb (d) Cs

Q. Which of the alkali metal is having least melting point ?

Q. Consider the following statements :
(I)

C s^{+}

ion is more highly hydrated than other alkali metal ions.
(II) Among the alkali metals

L i, N a, K,

and

R b, L i

has the higher melting point.
(III) Among the alkali metals, only

L i

forms a stable nitride by direct combination.

Q. Consider the following statements:
1.

C s^{+}

is more highly hydrated than the other alkali metal ions.
2. Among the alkali metals

L i, N a, K

and

R b

, lithium has the highest melting point.
3. Among the alkali metals only lithium forms a stable nitride by direct combination.
Out of these statements:

Q. Among alkali metals which element do you expect to be least electronegative
a). K. B). Na. C). Cs. D.) Fr

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Which of the alkali metal is having least melting point? (a) Na (b) K (c) Rb (d) Cs

Which of the alkali metal is having least melting point?

(a) Na (b) K (c) Rb (d) Cs