Phy. Sc. Ch. 19.txt

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bogera
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75091
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Phy. Sc. Ch. 19.txt
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2011-03-28 14:58:11
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Phy Science
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Phy. Science Ch. 19
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  1. Good conductors of heat and electricity
    metals
  2. ability to reflect light
    Luster
  3. can be hammered or rolled into sheets
    malleable
  4. can be drawn into a wire
    ductile
  5. the sharing of electrons between 2 metals bonded together
    metallic bonding
  6. group 1 on periodic table
    alkali metals
  7. most reactive group of elements; rarely found in nature
    alkali metals
  8. elements in which the nucleus breaks down giving off particles and energy
    radioactive elements
  9. group 2 on periodic table (2 valence electrons); extremely reactive and not found in nature in alone
    alkaline earth metals
  10. metal used to produce the brilliant white color in fireworks
    magnesium
  11. groups 3 through 12 on the periodic table
    transition elements
  12. iron, cobalt and nickel
    iron triad
  13. copper, silver and gold
    coinage metals
  14. metal used in electric wiring:
    copper
  15. the only metal that is liquid at room temperature
    mercury
  16. two metals used to coat other metals
    zinc and cadmium
  17. elements with atomic numbers 58-71
    lanthanides
  18. elements with atomic numbers 90-103
    actinides
  19. element that is best known for nuclear weapons
    uranium
  20. metals in the Earth's crust that are combined with other elements
    ores
  21. in metallic bonding, positively charged metallic ions are surrounded by a ________________.
    cloud of electrons
  22. metals that have one electron in the outer energy level of each atom
    alkali metals
  23. metals that have two electrons in the outer energy level
    alkaline earth metals
  24. poor conductors; usually gases or brittle solids at room temperature
    nonmetals
  25. type of bonding where electrons are shared between two elements
    covalent bonding
  26. type of bonding when electrons are gained or lost
    ionic bonding
  27. electrons that can be lost, gained or shared
    valence electrons
  28. most common element in the universe; highly reactive
    hydrogen
  29. two atoms of the same element bonded together
    diatomic molecule
  30. group 17 on periodic table, usually diatomic molecules
    halogens
  31. a compound formed when a metal gives an electron to a halogen and they bond together
    salt
  32. chemical symbol for table salt:
    NaCl
  33. process when a solid changes directly to a gas skipping the liquid phase
    sublimation
  34. example of substance that goes through sublimation
    dry ice
  35. group 18 on the periodic table
    noble gases
  36. very stable group of elements; full outer energy level
    noble gases
  37. element that is commonly used in blimps and balloons
    helium
  38. 2 elements used in lighting
    neon and argon
  39. makes up 90% of the atoms in the universe
    hydrogen
  40. elements that have properties of both metals and nonmetals
    metalloids
  41. elements that form both ionic and covalent bonds
    metalloids
  42. partial conductors, good for computers
    semiconductor
  43. group 13 on the periodic table (mixed metals)
    Boron group
  44. group 14 on the periodic table
    Carbon group
  45. elements with different molecular structure; carbon, silicon and diamonds are examples
    allotrope
  46. group 15 on the periodic table
    nitrogen group
  47. group 16 on the periodic table (makes up 20% of air, protects us from the sun's UV rays
    oxygen group
  48. important element used in smoke detectors
    americium
  49. elements that have more than 92 protons and are unstable
    transuranium elements
  50. diamond, graphite and quartz are allotropes of ________.
    carbon
  51. elements that are created by scientists and not found naturally on earth
    synthetic
  52. synthetic elements are found in this group
    actinides
  53. in the gaseous state, this group forms diatomic covalent molecules
    halogens
  54. an allotrope of carbon that is hard and is often used in jewelry
    diamond
  55. an allotrope of carbon that is soft and can be used as a lubricant
    graphite
  56. when hydrogen reacts with active metals it _______.
    gains one electron
  57. group of elements that has two electrons in its outer energy level
    alkaline earth metals
  58. this element is a nonmetal but is placed in group 1 because it has 1 electron in its outer level
    hydrogen
  59. number of electrons in the outer level of an element
    valence electrons

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