[Verse 1] Planck cracked the oven's glow, said heat comes wrapped in packets Einstein kicked the photoelectric door, showed light in little tickets Not a wave alone, mon frère — every photon rides as courier Hydrogen's spectrum sings four lines, a secret barcode's furor Balmer strung the beads, Rydberg wrote the whole equation Bohr caged the electron tight, fixed rings like a train station n equals one, ground-floor rent — jump the gap, you flash a photon But helium broke his cage — two electrons, and the model's frozen [Chorus] n, l, m sub l, m sub s — c'est l'adresse de l'électron Quatre chiffres, une maison, chaque particule a son nom Shell to shape to spin, mon amour, jamais deux pareils Pauli dit non — no two dance the same quantum ballet [Verse 2] De Broglie said the matter waves, wavelength equals h over p Heisenberg drew the curtain down — know the speed, lose the whereabouts, c'est la clé Schrödinger penned the equation, psi squared paints where it might appear Split the radial from angular — two melodies, one atmosphere Radial counts the rings, a node's where the wave goes to zero Angular sculpts the cloud — s a sphere, p a bowtie hero d unfurls a cloverleaf, f gets stranger, wilder, rare Count the nodes as n minus one — geometry hiding in the air [Chorus] n, l, m sub l, m sub s — c'est l'adresse de l'électron Quatre chiffres, une maison, chaque particule a son nom Shell to shape to spin, mon amour, jamais deux pareils Pauli dit non — no two dance the same quantum ballet [Verse 3] Spin's the secret twirl inside, Stern and Gerlach split the beam Silver atoms forked in two — proof this spinning isn't dream Pauli's law: one seat per set of numbers, never double-booked Hund keeps them lonely first, unpaired before they're crooked Shielding's inner shells that block the nucleus's grip Penetration's the s-orbital diving deep, taking the trip That's why 4s fills before 3d — it's closer, feels charge sooner Then 3d drops below once electrons crowd the tuner Slater's rules just count the shield, Zeff is what remains Titanium's 3d clings tighter — 4s leaves first, ionize its chains [Bridge] Hartree-Fock guesses a field, lets each electron feel the rest Loops it back, self-consistent, till the guess agrees with the test But heavy nuclei bend physics — relativity storms the ball Gold's s-electrons race near light, contract, drink blue, and glow gold for all Mercury's core pulls its shell so tight, the bonds go loose, it pools like rain Spin-orbit splits the p in half, d and f swell, stretch, and reign [Chorus] n, l, m sub l, m sub s — c'est l'adresse de l'électron Quatre chiffres, une maison, chaque particule a son nom Shell to shape to spin, mon amour, jamais deux pareils Pauli dit non — no two dance the same quantum ballet [Outro] Écoute l'atome, il chante en secret Every element's a verse the quantum numbers set C'est l'adresse de l'électron — now you hold the key
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