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Inorganic Chemistry   Group II Elements
[object Object],[object Object],[object Object],Polarisation of electron cloud of an anion by a cation
+ - + - ,[object Object],- + +
[object Object],[object Object],[object Object],Decomposition of Group II nitrates occurs  M 2+ N -  O O O M 2+ O 2- +  NO 2 Heat Bond is weakened due to polarisation of electron cloud by cation Polarisation of electron cloud of nitrate ion by a Group II cation.  + -
In summary,  Down the group, Charge density of cation decreases Polarising power of cation decreases Distortion of electron cloud of anion decreases Weakening of bonds within anion to a lesser extent Decomposition temperature increases Size of cation increases ,[object Object],Ease of thermal decomposition decreases Thermal stability increases

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Polarisation