Principles

Question 1

There is a fundamental limitation to just how precisely we can know both the position and momentum of a particle at a given time.

Answer 1

Heisenberg Uncertainty Principle

Question 2

In a given atom, no two electrons can have the same set of four quantum numbers. An orbital can hold only two electrons, and they must have opposite spins.

Answer 2

Pauli Exclusion Principle

Question 3

As protons are added one by one to the nucleus to build up the elements, electrons are similarly added to the orbitals.

Answer 3

Aufbau Principle

Question 4

The lowest energy configuration of an atom is the one having the maximum number of unpaired electrons allowed by the Pauli principle.

Answer 4

Hund’s Rule