What is the maximum number of electrons present in the main energy level in which the 'g' subshell appears for the first time? Find the atomic number of the element to be discovered in which the differentiating electron is the only electron in the first 'g' subshell

Explanation

Corresponding 'f' value of 'g' subshell is '4'. Principal quantt1m number in which 'g' subshell can exist is '5'. The maximum number of electron!r that can be accommodated in fifth orbit is 2 x 52 = 50 electrons. Orbitals to be filled before filling of 'Sg' subshell are: 1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p, 6s, 4f, 5d, 6p, 7s, 5f, 6d, 7p, 8s, 5g. Atomic number of the element should be 121.