Question

why this 2 es doesnt paired?​

Answer 1

Explanation:

Two ways I'd like to explain it through:

• $\\\tt [Mn(CN)_{6}]^{3-}$ has an octahedral geometry (number of lig _and is 6) . And to maintain that geometry given configuration is gained by the atom.
• While doing the configuration as per crystal field theory, we have $\\\tt Mn^{3+}$ as $\\\tt t_{2g}^{3} e_{g}^{1}$ when the pairing occurs we get the new configuration as $\\\tt t_{2g}^{4} e_{g}^{0}$ (Crystal Field theory).