Question

The magnetic nature of elements depends on the presence of unpaired electrons. Identify the configuration of transition elements which shows highest magnetic momentum:

• A. $3d^{7}4s^2$
• B. $3d^{5}4s^1$
• C. $3d^{8}4s^2$
• D. $3d^{2}4s^2$

Answer 1

The correct option is B $3d^{5}4s^1$

The magnetic nature of elements depends on the presence of unpaired electrons. Chromium $\left(Cr\right)$ has the electronic configuration of $\left[Ar\right]3d^{5}4s^1$. It shows the maximum number of unpaired electrons.

$Cr=1s^2,2s^2,2p^6,3s^2,3p^6,3d^5,4s^1$