1. Periodic Trends

2. 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. Size of the atom video

14. Decreases (  ) Across Period

15. Increases (  ) Down Group

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

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

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

19. PERIODIC TRENDS Ionic Radius Ionization Energy Electronegativity

20. IONIC RADIUS Size of the Ion

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

26. Increases (  ) Down Group

27. PERIODIC TRENDS Ionic Radius Ionization Energy Electronegativity

28. Ionization Energy Energy requires to remove an electron video

29. Increases (  ) Across Period

30. Decreases (  ) Down Group

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

33. PERIODIC TRENDS Ionization Energy Ionic Radius Electronegativity

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

36. Increases (  ) Across Period

37. Decreases (  ) Down Group

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

39. Which group is more ionic? More electronegative? – Alkali Metals and Alkaline-Earth Metals

40. WHY?