(UED) Canonical, registry-ready directory aligning isotopes, roles, and applications. Z 1–10 Z Symbol Element Key Isotopes Immediate Role Applications 1 H Hydrogen 1H, 2H(D), 3H Life, water, fusion Water, fuels, fusion 2 He Helium 3He, 4He Cryogenics, fusion MRI cooling, superfluids 3 Li Lithium 6Li, 7Li Batteries, fusion targets Li-ion storage, ceramics 4 Be Beryllium … Continue reading Unified Elements Directory