7th Grade Ch 3 Sec 4 Nonmetals & Metalloids

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  • 1. Ch. 3 Sec. 4 Nonmetals & Metalloids
  • 2. Nonmetal
    • Element that lacks most properties of metals
      • dull- not shiny
      • brittle- not malleable
      • poor conductors
  • 3. Nonmetals
    • Located at right of zigzag line on periodic table
    • 10/16 = gases
    • Most form compounds, except Group 18
  • 4.  
  • 5. The table salt on a pretzel is mined from deposits found on Earth. The same compound can also be formed from a reaction between the metal sodium and the nonmetal chlorine.
  • 6. Boron Family
    • Group 13
  • 7. Carbon Family
    • Group 14
    • C (nonmetal)  Pb
    • 4 valence electrons
  • 8. Carbon Family
    • Contains elements important to life & computers
    • Carbon = basis for an entire branch of chemistry
    • silicon & germanium- important semiconductors
  • 9. Nitrogen Family
    • Group 15
    • N  Bi
    • 2 nonmetals- N & P
    • 5 valence electrons
  • 10. Nitrogen Family
    • Group 15
    • Nitrogen makes up over ¾ of the atmosphere.
    • Nitrogen and phosphorus are both important in living things.
    • Most of the world’s nitrogen is not available to living things.
    • The red stuff on the tip of matches is phosphorus.
  • 11. Diatomic molecules
    • Compounds of 2 identical
    • atoms
  • 12. 
  • 13.  
  • 14.  
  • 15. Oxygen Family
    • Group 16
    • O  Po
    • 3 nonmetals- O, S, Se
    • 6 valence electrons
  • 16.  
  • 17. Halogen Family
    • Group 17
    • F  At
    • 7 valence electrons
    • very reactive
    • typically gains or shares 1
    • electron
  • 18.  
  • 19. Halogens
    • Group 17
    • Very reactive, volatile, diatomic, nonmetals
    • Always found combined with other element in nature
    • Used as disinfectants & to strengthen teeth
  • 20. Noble Gases
    • group 18
    • He  Rn
    • 8 valence electrons
    • very stable & unreactive
    • do not form compounds b/c do not gain, lose, or share valence electrons
  • 21.  
  • 22. The Noble Gases
    • Group 18
    • VERY unreactive, monatomic gases
    • Used in lighted “neon” signs
    • Used in blimps to fix the Hindenberg problem.
    • Have a full valence shell.
  • 23. The Noble Gases
  • 24. Hydrogen
    • alone in upper corner
    • not grouped in a family
    • very diff. properties
    • has 1 proton & 1 electron
    • some have neutrons
  • 25. Metalloids
    • on border between metals & nonmetals
    • 8 metalloids
    • characteristics of both metals & nonmetals
  • 26. Metalloids
    • most useful property= varying ability to conduct electricity
      • used to make semiconductors = can conduct electricity under certain conditions
  • 27. Periodic Table of Elements Name each family and give a description of each, include examples from each group. Name______________________ Date________________ 15 14 13 Li Fr Very reactive Alkali metals 18 17 16 12 11 10 9 8 7 6 5 4 3 2 1
  • 28. Bo
  • 29.