why Lithium has largest size ion in aqueous solution( even greater than Cs ) Cs ion has 4 additional shells as compared to Li ion and also more number of neutrons and protons , so Cs should have larger size (and least mobility in water)

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Q. The mobilities of the alkali metal ions in aqueous solution are

L i^{+} < N a^{+} < K^{+} < R b^{+} < C s^{+}

because :

Q. Why does cesium

(C s)

have a larger atomic radius than lithium

(L i)

Q. Assertion :Size of the hydrated ion is in order

L i^{+} > N a^{+} > K^{+} > R b^{+} \geq C s^{+}

which is just reverse of ionic size Reason: Greater the charge or charge density, smaller the ionic size, greater the hydration hence, greater the size of the hydrated ion.

The radius ratio of $C s^{+}$ to $C l^{-}$ is 0.90. If the radius of $C l^{-}$ ion is $1.80 \circ A$ , the false statement regarding the CsCl structure is ?

Q. Cesium bromide crystallises in a cubic system. Its unit cell has

C s^{+}

ion at the body centre and

B r^{-}

ion at each corner. Its density is

4.44 g m c m^{- 3} .

Determine
(a) each length of the unit cell.
(b) size of

B r^{-}

ion if the radius of

C s^{+}

is 174 pm, and
(c) fraction of volume occupied by molecules in the unit cell.

[

C s = 132.90 g . m o l^{- 1}

and

B r = 79.9 g . m o l^{- 1}

]

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