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Understanding Periodic Trends in Atomic Properties

Explore how nuclear charge, shielding, and atomic radius influence periodic trends. Learn about ions, ionic radius, ionization energy, and electronegativity in the periodic table. Discover the behavior of elements across periods and down groups.

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Understanding Periodic Trends in Atomic Properties

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  1. Periodic Trends

  2. Periodic Trends • Nuclear Charge • Shielding • Atomic Radius

  3. Nuclear Charge • Charge of the atom

  4. Increases()Across Period

  5. Increases ()Down Group

  6. Periodic Trends • Nuclear Charge • Shielding • Atomic Radius

  7. SHIELDING • Lower energy levels “shield” higher energy levels from full nuclear charge

  8. NO CHANGE ACROSS PERIODS

  9. Increases ()Down Group

  10. Periodic Trends • Nuclear Charge • Shielding • Atomic Radius

  11. Atomic Radius Size of the atom video

  12. Decreases ()Across Period

  13. Increases ()Down Group

  14. IONS • An atom or group of atoms that have a positive and negative charge • Form when electrons are transferred b/w atoms

  15. Cations • Positively charged ion • Form by losing electron(s) • Smaller than original atom • Metals

  16. Anions • Negatively charge ion • Form by gaining electron(s) • Larger than original atom • Non-metals

  17. PERIODIC TRENDS • Ionic Radius • Ionization Energy • Electronegativity

  18. IONIC RADIUS • Size of the Ion

  19. Decreases ()Across Period Cations smaller than anions-trend restarts with NM

  20. Increases ()Down Group

  21. PERIODIC TRENDS • Ionic Radius • Ionization Energy • Electronegativity

  22. Ionization Energy Energy requires to remove an electron video

  23. Increases ()Across Period

  24. Decreases ()Down Group

  25. Ionization Energy • 1st ionization energy = 1 + charge ion • 2nd ionization energy = 2 + charge ion • 3rd ionization energy = 3 + charge ion.

  26. PERIODIC TRENDS • Ionization Energy • Ionic Radius • Electronegativity

  27. Electronegativity Ability of an atom to attract electron(s) video

  28. Increases ()Across Period

  29. Decreases ()Down Group

  30. Reactivity • Metals • Periods –  across • Groups –  down • Nonmetals • Periods-  across • Groups-  down

  31. Which group is more ionic? More electronegative? • Alkali Metals and Alkaline-Earth Metals

  32. WHY?

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