Consider ground-state helium holding two electrons in orbit. If one of the electrons has quantum numbers (n, l, ml, ms) of 1, 0, 0, -1/2 respectively, the quantum numbers for the other electron will be

Heisenberg's Uncertainty Principle: The position and momentum of a particle cannot both be measured precisely at the same time.

The Pauli exclusion principle: No two electrons in an atom can occupy the same quantum state.