What is the maximum number of electrons that can be present in an atom in which the highest principal quantum number is 4 ?

What is the maximum number of electrons that can be present in an atom

1.	What is the maximum number of electrons that can be present in an atom in which the highest principal quantum number is 4 ?
Answer» SOLUTION :Keeping in VIEW aufbau principle, the electronic configuration of atom having highest value of n = 4 will be `1s^(2) 2s^(2) 2p^(6) 3s^(2) 3p^(6) 4s^(2) 3d^(10) 4P^(6)` (After 4p, filling of 5s starts) Hence, maximum number of electrons present = 36 (KR)