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How many unpaired electrons are there in $Ni^{2+}$


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$Ni^{2+}:1s^2,2s^22p^6,3s^23p^63d^8$.Rest all posses either no unpaired electrons $(Sc^{3+},Zn^{2+})$ or have one unpaired electron ($Ti^{3+})$
Hence (b) is the correct answer.
answered Jan 10, 2014 by sreemathi.v

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