The odor of a smelly shower drain can be eliminated by removing debris from the drain. Discarding the odor-causing material in the garbage outside the home ensures the smell does not invade other areas. Boiling water dissolves oils and grease deposited on the sides of the pipe in the drain, which add to the smell.
Luckily for us, Nernst derived an equation that allows us to determine at what point the two forces (chemical and electrical gradients) balance each other - in other words, at what point we have an ionic equilibrium.
In summary, Hund's Rule, the Aufbau Principle, and the Pauli Exclusion Principle help us define how electrons fill the orbitals within an atomic structure. This helps us predict the location of electrons in an atom as we increase the number of electrons.