Which of the following arrangements shows the correct order of decreasing paramagnetism?
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answer is 2.
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Detailed Solution
N1s22s22p3 has 3 unpaired electrons.O1s22s22p4 has 2 unpaired electrons.Al1s22s22p63s23p1 has 1 unpaired electron.Ca(Ar)184s2 has 0 unpaired electrons.So, correct order of decreasing paramagnetism is N > O > Al > Ca.