• Quantum Mechanics governs electron motion and allows the energies of an atom to
have only discrete values.
• The energy
of an atom is said to be
quantised. (quanta = packet)
Schrödinger Equation
H Y = E Y [Y - Greek psi]
Y = atomic wavefunction
E = atomic energy
H = Hamiltonian operator ( incl. e-/ e- effects)
• Although Y is not
experimentally observable the
function Y2 is measurable.