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The electronic configuration of elements A, B and C are [He]2s1 , [Ne]3s1 and [Ar]4s1 respectively. Which one of the following is the correct decreasing order for IE1 (in kJ mol–1) of A, B and C?
A
A > B > C
B
C > B > A
C
B > C > A
D
C > A > B
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