Match each rule to what it forbids or requires

Exercise and reference answers

Matching pairs

Left
Pauli exclusion principle
Right
no two electrons share all four quantum numbers
Left
Hund's rule of maximum multiplicity
Right
every orbital in a subshell gets one electron before any pairs
Left
The (n + l) rule
Right
orbitals fill in order of increasing energy
Left
Heisenberg uncertainty principle
Right
position and velocity cannot both be exact

Two rules govern how electrons fill the orbitals. Source: syllabus Chemistry Part I, Ch 2 Structure of Atom.