Which is correct increasing order of their tendency of the given eleme

1.	Which is correct increasing order of their tendency of the given elements to from M^(3-) ion?
Answer» `BigtSbgtAsgtPgtN` `BiltSbltAsltPltN` `NltPltSbltBiltAs` `NigtSb~N~PgtAs` Solution :On moving down the group,the stability of -3 oxidation STATE decreases this is DUE to the following reasons(i) On descending a group the size of the ATOM or ion increases.As a result,attraction of the nucleus per newly added electron decreases.(ii)A large anion cannot fir easily into lattice of asmall cation.(III)As the NEGATIVE charge on the ion increases.it becomes more and more susceptible to polarisation.

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