What is the number of electrons present in d-subshell if its atomic number is 27 and oxidation state is +2 ?
What is the number of electrons present in d-subshell if its atomic number is 27 and oxidation state is +2 ?
8
7
6
5
Solution
The atomic number 27 and oxidation state of +2 is shown by Cobalt $(Z=27)$ : $[\mathrm{Ar}] 3 \mathrm{~d}^7 4 \mathrm{~s}^2$. Hence, the number of electrons present in d- subshell is 7 .