What is the maximum number of electrons that can be filled in the outermost shell?

Q. The maximum number of electrons that can be filled in the shell with the principal quantum number $n=4$ is:

Q. Find the maximum number of electrons that can be filled in the 4${}^{th}$ shell.

Q. Choose the incorrect statement(s) among the following.
1. The maximum number of electrons present in L and N shells are 8 and 18 respectively,
2. The maximum number of electrons that can be accommodated in the outermost orbit is 8.
3. Shells are filled in a step-wise manner

Q. If by Neil's Bohr formula the no. Of electrons is 2n^2 . And if 3rd shell contains 18 electrons . Why did he said that the outermost shell can maximum hold 8 shells?

Q. The maximum number of electrons that can be filled in an orbit (shell) can be found by using the formula $2n^2$; where ‘n’ stands for an orbit’s serial number. Calculate the maximum number of electrons that can be accommodated in the $2^{nd}$ orbit (shell) of an atom.