3. N1-1 (Nitrogen, 1st letter = N), O2-3 (Oxygen, 3rd letter = y), F4-5 (Fluorine, 5th letter = r): "Nyr"
4. Ne3-4 (Neon, 4th letter = o), Na4-1 (Sodium, 1st letter = S), Mg2-5 (Magnesium, 5th letter = m): "osm"
Combine the letters: "Dih Enb Nyr Osm"
Rearrange: "Bonding Harmony"
---
Final Phrase: "Elements bond in harmony."