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From each set, choose the atom which has...

From each set, choose the atom which has the largest ionization enthalpy :
(a) F, O, N (b) Mg, P, Ar (c ) B, Al, Ga

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The correct Answer is:
(a) F (b) Ar ( c) B
(a) F, O, N all belong to 2nd period . Among these F has the highest `Delta_(i) H_(1)` because of its smallest size and highest nuclear charge.
(b) Mg, P, Ar all lie in the 3rd period .Among these Ar has the highest `Delta_(i) H_(1)` because it has stable inert gas configuration
(c ) B, A1, Ga all lie in group 13.B has the highest `Delta_(i) H_(1)` due to its smallest size
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PRADEEP-CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES -Problems For Practice
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