Electrons are not accommodated is any given shell until and unless the inner shell is filled
According to Bohr and Bury models, the electrons are not accommodated in a given shell, unless the inner shells are filled.
The d subshell of an element with 4 shells is completely filled and there are two electrons in the 4th shell
a. How many electrons can be accommodated in the d subshell?
b. Write the subshell electronic configuration of the element.