Teaching UP TGT Mock Test Series 2025 General Science Chemistry Classification of Elements and Periodicity in Properties
Which of the following is incorrect regarding rules for writing the number of electrons in different energy levels or shells?
1
The maximum number of electrons present in a shell is given by the formula 2n2, where ‘n’ is the orbit number or energy level index, 1, 2, 3 _
2
The maximum number of electrons that can be accommodated in the outermost orbit is 8.
3
Electrons are not accommodated ina given shell, unless the inner shells are filled.
4
Electrons are accommodated in an outermost cell before the inner shells are filled in case of gases.