Question

number of degenerate orbitals for first excited state of H-atom is -

Answer 1

thus degeneracy( number of orbitals of equal energy for the electron to be excited in ) is 9 {1 s orbital+3p orbitals +5d orbitals} however hydride ion has a configuration of 1s(2) FIRST EXCITED STATE: 1s(1) 2s(1)