1.

The electronic configuration of the fourth transition element isA. `1s^(2),2s^(2),2p^(6),3s^(2),3p^(6),4s^(2)`B. `1s^(2),2s^(2),2p^(6),3s^(2),3p^(6),3d^(2),4s^(2)`C. `1s^(2),2s^(2),2p^(6),3s^(2),3p^(6),3d^(10),4s^(2),4p^(2)`D. `1s^(2),2s^(2),2p^(6),3s^(2),3p^(6),3d^(10),4s^(2),4p^(1)`

Answer» Correct Answer - B
Transition elements are those elements which have partially filled d-subshell in their elementary from . Therefore, the general electronic configuration of d-block elements is `(n-1)d^(1-10)ns^(1-2)`


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