Q.

With which of the following electronic configuration an atom has the lowest ionisation enthalpy

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a

1s22s22p5

b

1s22s22p3

c

1s22s22p53s1

d

1s22s22p6

answer is C.

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Detailed Solution

Amongst the given choices option {c) has a lowest ionization enthalpy because its electronic configuration represent the bigger size and we know that ionization enthalpy decrease with increase of no. of orbit.
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