Which species contain unpaired electron, Chemistry

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Which species contain unpaired electron?

BaO2
here oxidation number of Ba is +1

Ba(+) has 1 electron in its outermost shell so its unpaired

in KO2 . .oxd state of K is +1 so no unpaired electrons(noble gas config for K)

in AlO2(-) . . oxd state of Al is +3 so no unpaired electrons

in NO2(+). . oxd no of N is +5 so no unpaired electrons(noble gas config for N)


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