[Verse 1] Male: Sodium loses one electron, chlorine grabs it tight, Female: lattice energy's the toll paid to build the crystal site. Male: Born-Haber draws the loop — sublime, then ionize, Female: break the bond, add the electron, watch the solid crystallize. Male: Kapustinskii skips the guesswork, radius and charge collide, Female: Fajans warns: small and charged means the ionic bond can't hide — it leans covalent, polarized, the electron cloud gets pulled, sharing creeps in where pure transfer used to rule. [Chorus] Ionic snaps, covalent shares, metallic hands it round, small and charged, hold on tight — that's the Fajans sound. Left side gives, right side takes, the middle learns to blend, follow the electrons home and you'll know where the bond will bend. [Verse 2] Female: Lewis dots on paper, count the formal charge with care, Male: subtract the bonds and lone pairs from the valence sitting there. Female: VSEPR shapes the molecule, repulsion draws the line, Male: five domains go trigonal, six go octahedral fine. Female: but molecular orbitals show what Lewis couldn't see — sigma, pi, bonding, anti, climbing rung by rung, bond order's half of bonding minus anti when the count is done. Nitrogen's sigma sits below its pi, triple-bonds it strong, oxygen flips that order — paramagnetic all along. [Chorus] Ionic snaps, covalent shares, metallic hands it round, small and charged, hold on tight — that's the Fajans sound. Left side gives, right side takes, the middle learns to blend, follow the electrons home and you'll know where the bond will bend. [Verse 3] Male: Sulfur hexafluoride breaks the octet rule for fun, three-center four-electron bridges hold six fluorines to one. Female: xenon difluoride, linear ghost, hypervalent and calm, Male: diborane's short two electrons — banana bonds the balm, bridging hydrogens hover where boron shares what it hasn't got. Female: metals swim in seas of bands, diamond's gap runs cold, silicon's a narrower gate, tin and lead just conduct and fold. Van Arkel's triangle maps it — ionic, covalent, metallic corner, electronegativity's the compass telling you which one's the mourner. [Bridge] Carbon wears four faces — diamond, graphite, the fullerene sphere, phosphorus goes white to red to black, the safest hides from air. Water bends, hydrogen-bonds, its boiling point too high to be right, sodium's oxide basic, chlorine's bites acidic in the light — aluminum sits amphoteric, dissolves in either creek, across the period the oxides climb from strong to sharp to bleak. [Chorus] Ionic snaps, covalent shares, metallic hands it round, small and charged, hold on tight — that's the Fajans sound. Left side gives, right side takes, the middle learns to blend, follow the electrons home and you'll know where the bond will bend. [Outro] Male: Every bond's an answer to the question where you stand, Female: on the table's grid of promises, electron in your hand.
← Module 5 — Periodic Trends (Weeks 6–7) | Module 7 — Hydrogen & the s-Block (Week 10) →