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?

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

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

Which wavelength corresponds to the boundary between UV and visible radiation?

What wavelength corresponds to the boundary between visible and IR radiation.

An atom is in its ground state if: 

Consider the energy level diagram sketch below.

Which of the transitions, a) - e), represents a hydrogen atom in an excited state emitting light and ending up in its ground state?

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 84.9 kPa?

[Atmospheric pressure at sea level is 101.3 kPa.]

What is the maximum number of electrons that can be accommodated, in total, for all of the 3d orbitals?

How many atomic orbitals have the principal quantum number n = 2?