Hydrogen and s-Block Elements

30 lessons, pages 1861–1890.

  1. Hydrogen's Place in the Periodic Table — Why hydrogen resembles but does not fully belong to one main group
  2. Hydrogen Isotopes and Their Uses — Protium, deuterium and tritium as nuclides of one element
  3. Molecular Hydrogen: Preparation and Properties — H2 formation, combustion and reducing behaviour
  4. Hydrogen Bonding and Hydrogen as a Fuel — Distinguishing H2 fuel chemistry from intermolecular hydrogen bonding
  5. Ionic, Covalent and Interstitial Hydrides — Classifying hydrogen compounds by bonding context
  6. Ionic Hydrides and Their Reactions — Hydride H- as a reducing base in reactive metal compounds
  7. Covalent Hydrides Across the Periodic Table — Electron-deficient, electron-precise and electron-rich hydrides
  8. Water as a Hydrogen Compound — Structure, polarity and chemically significant solvent behaviour
  9. Hydrogen Peroxide: Structure and Reactions — Peroxide O-O bonding and dual redox behaviour
  10. Heavy Water and Isotope Effects — D2O composition and changes caused by isotopic mass
  11. Defining the s-Block — Valence ns1 and ns2 patterns in groups 1 and 2
  12. Alkali-Metal Electronic Structure — One valence electron and the stability of M+ ions
  13. Alkali-Metal Atomic and Ionic Trends — Size, ionisation energy and hydration effects down group 1
  14. Alkali Metals with Water — Electron transfer, hydroxide formation and hydrogen release
  15. Alkali Metals with Oxygen — Oxide, peroxide and superoxide products under stated conditions
  16. Alkali Metals with Halogens and Hydrogen — Salt formation and hydrides from highly electropositive metals
  17. Lithium's Anomalous Behaviour — Small ion size and differences from heavier alkali metals
  18. Lithium and Magnesium Diagonal Relationship — Selected similarities without treating the elements as identical
  19. Sodium Compounds and Applications — Sodium chloride, hydroxide, carbonate and hydrogencarbonate
  20. Potassium Compounds and Plant Nutrients — Potassium salts, solubility and chemical context of fertilisers
  21. Alkaline-Earth Electronic Structure — Two valence electrons and common M2+ formation
  22. Alkaline-Earth Periodic Trends — Size, ionisation energy and reactivity down group 2
  23. Group 2 Metals with Water and Oxygen — Comparing Be, Mg, Ca, Sr and Ba reactions under stated conditions
  24. Beryllium's Anomalous Chemistry — Small Be2+ size, covalency and amphoteric behaviour
  25. Magnesium Compounds and Chemistry — MgO, Mg(OH)2 and magnesium's role in chemical materials
  26. Calcium Carbonate and Lime Chemistry — CaCO3 decomposition, CaO hydration and carbonation
  27. Hardness of Water — Calcium and magnesium ions in temporary and permanent hardness
  28. Solubility Trends in Group 2 Salts — Hydroxides and sulfates across the alkaline-earth metals
  29. Flame Colours and s-Block Identification — Emission from excited atoms and limitations of flame tests
  30. Hydrogen and s-Block: Integrated Review — Connecting hydrogen chemistry, periodic trends and characteristic reactions