Consider the energy level diagram sketch below.

Which of the transitions, a) to e), represents a hydrogen atom absorbing light and being ionised from an excited state?

What are the names and symbols used for the quantum numbers which describe electrons in atoms?

An atom is in an excited state if: 

Which of the following is the correct abbreviated electron configuration for a sodium atom in its ground state?

Which of the following options ranks the sections of the electromagnetic spectrum in order of increasing frequency (i.e. smallest first)?

How many 3s orbitals exist?

The two clouds of electrons in a π-bond (shown below) represent ____________

What is the maximum number of electrons which can reside in the 2p orbitals? 

Which of the following statements is true for an orbital with principal quantum number, n = 2, and angular momentum quantum number, l = 1? 

Consider the following sketch of the interaction energy for two atoms as a function of distance between the atoms.

Which label, a) to e) points to the region where the attraction between the nuclei and electrons is dominating the interaction?