Which one of the following has the lowest ionisation energy?
A
1s22s22p6
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B
1s22s22p63s1
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C
1s22s22p5
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D
1s22s22p3
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Solution
The correct option is C1s22s22p63s1 In the Periodic Table, the minimum ionisation energy is found at alkali metals. Hence sodium (electronic configuration =1s22s22p63s1) has the lowest ionisation energy.