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Day 4 2-26

Q of the Day. Day 4 2-26. Most reactive metals = the _______ metals. Most reactive nonmetals = ________. Least reactive metals = ___________. alkali. halogens. transition. Assignment. Day 3 2-25. Read / Review section 6.1 AND complete #s 1-8 on page 166.

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Day 4 2-26

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  1. Q of the Day Day 4 2-26 • Most reactive metals = the _______ metals. • Most reactive nonmetals = ________. • Least reactive metals = ___________. alkali halogens transition

  2. Assignment Day 3 2-25 Read / Review section 6.1 AND complete #s 1-8 on page 166

  3. Objective / Essential Question How is the periodic table arranged? Day 4 2-26

  4. noble gases alkali metals halogens alkaline metals transition metals

  5. Metals Excellent conductors (Sea of electrons) even as solidsMobile electronsMetals are malleable and ductile Can be pulled into wire Can be pounded into sheet

  6. Can you figure out how reactivity changes on the periodic table?

  7. Periodic Trends Atomic radius: - Measure of size – radius of an atom - Atoms with more electrons do NOT necessarily have a larger atomic radius

  8. Periodic Trends - Atoms with more electrons do NOT necessarily have a larger atomic radius

  9. Periodic Trends - Atoms with more electrons do NOT necessarily have a larger atomic radius • Atoms get larger going down a group. • Atoms get smaller going across a period • So why?...

  10. Periodic Trends - Atoms with more electrons do NOT necessarily have a larger atomic radius As you move down a group you increase the number of energy levels in the atom and so the atom gets larger as expected.

  11. Periodic Trends As you move across a period, # of protons increases and outermost energy level stays the same, the attractive force between elecs. and pros. pulls the atom tighter (closer to nucleus) - Atoms with more electrons do NOT necessarily have a larger atomic radius

  12. Periodic Trends What’s bigger: B or Al B or N N or Zn C or Cl

  13. Homework Read / review Section 6.2 and complete #s 11-17 on page 173

  14. Q of the Day Day 5 2-27 • Why does the size of an atom decrease moving across a period? • What is more reactive Cl or Ar – Explain!!!

  15. Green = ? Blue = ? Red = ?

  16. Inert elements = ? Good Conductors = ?

  17. Review • What element is in Group 2, Period 3? • Name an element in Group 3 • How many valence electrons in Xe? • Give me an element with 1 valence electron.

  18. Partner Review • What element is in Group 17, Period 3? • What family of elements is the element above in? • How many valence electrons does it have?

  19. Periodic Trends Notes page 4 • What are ions? • - atoms that are charged due to the loss or gain of electrons • If an atom loses elecs. it becomes smaller and positive • If an atom gains elecs. it becomes larger and negative

  20. Periodic Trends • What are ions? • - If an atom loses elecs. it becomes smaller • If an atom gains elecs. it becomes larger PAGE 176-179 Which elements gain elecs.? Which elements lose elecs.? Pattern?

  21. Periodic Trends Elements on the right side of the periodic table form _________ ions Elements in the same group form ___________ ions negative The same

  22. Periodic Trends What’s bigger: F or F- Na or Na+ Na or Rb Na of Al F or Cl-

  23. Periodic Trends Octet rule – Atoms tend to gain, lose, or share electrons in order to acquire a full set of valence electrons (8) - 2 for H, He, Li, Be, + B notes page 6

  24. Assignment 1 Chapter 5

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