A transition element containing only one electron in 4s-orbital is:
A transition element containing only one electron in 4s-orbital is:
\({ }_{21} \mathrm{Se}\) write this as questio
\({ }_{23} \mathrm{Mn}\)
\({ }_{26} \mathrm{Fe}\)
\({ }_{29} \mathrm{Cu}\)
Solution
\({ }_{29} \mathrm{Cu}\) has the electronic structure of \(1 \mathrm{~s}^{2} 2 \mathrm{~s}^{2} 2 \mathrm{2p}^{6} 3 \mathrm{~s}^{2} 3 \mathrm{p}^{6} 4 \mathrm{~s}^{1} 3 \mathrm{~d}^{10}\). One electron moves from the 45 -orbital to attain a more stable state with completely filled \(\mathrm{d}\) orbital.
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