(a) Give three points of difference between lanthanoids and actinoids.

 (b) Give reason and select one atom/ion which will exhibit asked property : 

     (i) Sc^{3+} or Cr^{3+} (Exhibit diamagnetic behaviour)

     (ii) Cr or Cu (High melting and boiling point)

 

 

 
 
 
 
 

Answers (1)

(a) Lanthanoids

  • Most of them are not radioactive
  • Don’t show a wide range of oxidation state
  • Most of their ions are colourless

Actinoids

  • All are radioactive
  • Show a wide range of oxidation states
  • Most of their ions are coloured

 (b) 

(i) Sc^{3+} Exhibit diamagnetic behaviour, because of absence of unpaired electron.

(ii) Cr has High melting and boiling point, because of presence of strong intermetallic bonding than Cu.

 

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