Which of the electronic configuration of an atom has the lowest ionization enthalpy? 

(1) 1s2,2s22p5

(2)1s2,2s22p3

(3)1s2,2s22p6,3s1

(4)1s2,2s22p6

Concept Videos :-

#8 | Ionisation Enthalpy: Introduction
#9 | Calculation of Ionisation Enthalpy
#10 | Factors affecting Ionisation Enthalpy
#11 | Trends in Ionisation Enthalpy
#12 | Application of Ionisation Enthalpy
#13 | Solved Problems

Concept Questions :-

Ionization Energy (IE)

I.E is inversly proportional to size ..

and valance electron should be lesser.

 

Difficulty Level:

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