The diagram below shows several electronic energy levels of the hydrogen atom including the ground state energy level and an energy of 0. The energy of each level is to scale.

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

The partial pressure of O₂ in the atmosphere at sea level is 21.3 kPa. What is the partial pressure of O₂ on the top of a mountain, where the atmospheric pressure is 88.6 kPa?

[Atmospheric pressure at sea level is 101.3 kPa.]

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 there is no interaction between the atoms?

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?

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?

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

What type(s) of atomic orbitals are pictured below?

What is the maximum number of electrons that can be accommodated in each of the energy levels n=1, 2, 3 and 4 respectively?

Which statement correctly describes the physical meaning of the quantum numbers for a hydrogen atom?