8 Periodicity

• Across period 3

  • shielding stays roughly the same
  • nuclear charge increases so the nucleus attracts the electrons more
  • atomic radius decreases
• 1st ionisation energy across Period 3

  • 1st ionisation energy across Period 3 generally increase
  • number of electron shells remains the same, so shielding remains roughly the same
  • the nuclear charge increases
  • the attraction between the nucleus and the outermost electron increases