Classification of elements and periodicity in their properties and Chemical bonding

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Across
  1. 2. Scientist who proposed the modern periodic law based on atomic number.
  2. 4. Molecular shape of ammonia (NH₃).
  3. 5. Covalent bond formed by head-on overlap of atomic orbitals.
  4. 8. Enthalpy associated with the formation or separation of gaseous ions and an ionic solid.
  5. 10. Bond formed by sharing electron pairs between atoms.
  6. 12. Vertical column in the periodic table.
  7. 16. Bond order of the nitrogen molecule (N₂).
  8. 17. Molecular shape of methane (CH₄).
  9. 20. Rule stating that atoms tend to attain eight electrons in their valence shell.
  10. 23. Ability of an atom to attract shared electrons towards itself.
  11. 29. Linear molecule with the formula CO₂.
  12. 30. Number of unpaired electrons in the ground state of an oxygen molecule (O₂).
  13. 31. General trend in atomic radius down a group.
  14. 32. Block in which the differentiating electron enters an s-orbital.
  15. 35. Hybridisation of carbon atoms in ethyne (C₂H₂).
  16. 36. Covalent bond formed by sideways overlap of parallel orbitals.
Down
  1. 1. Horizontal row in the periodic table.
  2. 3. Arrangement in which particles occupy a regular, repeating pattern.
  3. 5. Hybridisation of carbon atoms in ethene (C₂H₄).
  4. 6. Block containing transition elements.
  5. 7. Block containing lanthanoids and actinoids.
  6. 8. Geometry associated with sp hybridisation.
  7. 9. Electrostatic attraction between oppositely charged ions.
  8. 11. Measure of molecular polarity, represented by the symbol μ.
  9. 13. Intermolecular attraction responsible for water's unusually high boiling point.
  10. 14. Molecular shape of water (H₂O).
  11. 15. Number of sigma bonds in a carbon–carbon double bond.
  12. 18. Pair of valence electrons not involved in bonding.
  13. 19. Elements in which the 4f orbitals are progressively filled.
  14. 21. Bond in which both shared electrons are donated by one atom.
  15. 22. Theory used to predict molecular shapes based on electron-pair repulsion.
  16. 24. Smallest unit of an element that retains its chemical identity.
  17. 25. General trend in metallic character down a group.
  18. 26. Most electronegative element in the periodic table.
  19. 27. General trend in atomic radius across a period from left to right.
  20. 28. Bond formed by the transfer of electrons from one atom to another.
  21. 33. Number of pi bonds in a carbon–carbon triple bond.
  22. 34. Hybridisation of the carbon atom in methane.