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← 1.5 Periodicity

Ionisation energy across a period

Chemistry · Grade 10 · about 40 minutes

First ionisation energy generally rises across a period; small dips at Al and S do not hide the pattern.

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Other lessons in this sub-strand

  1. Trends down a group
  2. Trends across a period
  3. Nuclear charge, distance and shielding
  4. What atomic radius means
  5. Atomic radius down a group
  6. Atomic radius across a period
  7. Ionic radius versus atomic radius
  8. First ionisation energy
  9. Ionisation energy down a group
  10. Ionisation energy across a period
  11. Successive ionisation energies
  12. Electron affinity
  13. Electronegativity
  14. Electronegativity trends
  15. Electronegativity difference and bond type
  16. Melting points of group I and group II metals
  17. Melting and boiling points of the halogens
  18. Melting points across period 3
  19. Electrical conductivity across period 3
  20. Physical properties of the alkali metals
  21. Chemical reactions of the alkali metals
  22. Group I in Kenya: salt and Magadi soda
  23. Group II compared with group I
  24. Chemical reactions of group II
  25. Group II in Kenya: limestone, cement and fluorspar
  26. Halogen displacement in depth
  27. Chlorine, hydrogen halides and Kenyan water
  28. Noble gases: group 0 behaviour
  29. Period 3 oxides: basic to acidic
  30. Period 3 hydrides
  31. Predicting properties from position
  32. Period 3 chlorides and a Kenya review