History of Periodic Table Flashcards
1
Q
What is the Aufbau principle?
A
When building up an electronic configuration of an atom in ground state, the electrons occupy the lowest available energy level.
2
Q
What is Hund’s Rule?
A
When two or more orbitals of equal energy are available, the electrons occupy them singly before filling them in pairs.
3
Q
What is Paulis Exclusion Principle?
A
No more than two electrons and they must have opposite spin.
