Chapter 6.7, Problem 3CP

Interpretation Introduction

Interpretation:

In a hydrogen atom, the orbitals higher in energy than $3s$ orbitalare to be identified.

Concept introduction:

The lower energy orbitals are filled before the higher energy orbitals.

Electrons first enter the orbitalthatcontains lower energy.

In equal energy orbitals, electrons first enter in an orbital with parallel spins.

The energies of orbitals in hydrogen atom, or any other one-electron ion, dependon the value of principal quantum number $(n)$.

Energy increases as $n$ increases. Hence orbital in the same shell have the same energy regardless of their subshell.

In a hydrogen atom, the sequence of orbital energy levels is as follows: $1s<2s=2p<3s=3p=3d<4s=4p=4d=4f$