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+2 votes
10.3k views
in Chemistry by (75.0k points)

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

(a) 1s2 2s2 2p3 

(b) 1s2 2s2 2p5 3s1 

(c) 1s2 2s2 2p6 

(d) 1s2 2s2 2p5

1 Answer

+1 vote
by (68.8k points)
selected by
 
Best answer

The correct option is: (b) 1s2 2s2p3s1 

Explanation:

The larger the atomic size, smaller is the value of the ionisation enthalpy. Again higher the screening effect, lesser is the value of ionisation potential. Hence option (b) has lowest ionisation enthalpy.

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