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Classification Of Elements And Periodicity In Properties

Question
CBSEENCH11008406
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The sequence of ionic mobility in aqueous solution is 

  • K+ > Na+ > Rb+ > Cs+

  • Cs+ > Rb+ > K+ >Na+

  • Rb+ > K+> Cs+ > Na+

  • Na+ > K+ >Rb+ >Cs+

Solution

B.

Cs+ > Rb+ > K+ >Na+

The smaller the size of ion, the greater the degree of hydration.
Mobility space of space ion space in space aqueous space solution space space space space proportional to space fraction numerator 1 over denominator size space of space ion space in space aqueous space solution end fraction
Generally in a group size or radii of ions increases, So Li has the smallest size thus bind a maximum number of water molecules with itself and becomes largest in size (in aqueous solution). Hence, the order of ionic radii (size) of alkali metal ions in aqueous solution is 
Li+ > Na+ > K+> Rb+ >Cs+
Thus, the order of mobility 


Li+ > Na+ > K+> Rb+ >Cs+

Some More Questions From Classification of Elements and Periodicity in Properties Chapter

Which property is the basis of long form of periodic table?

How many elements are placed in each period of the p-block?

What is the number of groups in: (i) p-block  (ii) d-block?

How many elements are present in:
(i) second period    
(ii) fourth period    
(iii) sixth period?

What is the name given to the s-block elements?

To which block the element with outer electronic configuration 4s23d10 belongs?

Why are there 10 elements in each series of d-block?

In terms of electronic configuration,
what is common in a given period and group?

Give the general electronic configuration of
(i) Transition elements     (ii) Inner transition elements.

Name the group and period to which an element with Z = 15 belongs ?

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