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in Classification of elements and periodicity in properties by (69.2k points)
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The first 2nd and 3rd ionization enthalpies of gallium are 579 KJ mol–1 ,1979 KJ mol–1 & 2962 KJ mol–1 even though the  iii  I.P is highest Ga3+ is the most stable because 

(a)  The energy loss is maximum resulting greater stability

(b)  The size of Ga3+ is smallest 

(c)  Ga3+ is most reactive 

(d)  It attains a stable configuration

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