Classification of Elements and Periodicity in Properties - Result Question 24

####24. Which of the following electronic configuration of an atom has the lowest ionisation enthalpy?

(a) 1s22s22p3

(c) 1s22s22p6

(b) 1s22s22p53s1

(d) 1s22s22p5

[2007]

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Solution:

  1. (b) 1s2,2s2,2p5,3s1 is an unstable configuration with the outermost electron in 3rd  orbit. Hence, it has lowest ionisation enthalpy.


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