1. Metals?
    Good conductors of heat and electricity. Shiny, ductile, and malleable. Most elements are metals. Most metals are solid at room temperature.
  2. Nonmetals?
    Exact opposite of metals. Second largest class of metals. Most non metals are gases. Solid non metals are dull and brittle.
  3. Metalloids?
    Have properties of both metals and non metals. Shiny and brittle. Can conduct electricity at certain temperatures. Solid at room temperature.
  4. Atoms of elements in different classes?
    Vary in number of valence electrons, this explains their difference in reactivity and conductivity.
  5. Valence electrons?
    Electrons in the outer energy level in the atom. The number of  valence electrons detirmines the elements reactivity or how it can react with other elements.
  6. Group 1 consists of?
    Hydrogen and alkali metals. Hydrogen is the most reactive non metals. Alkali metals are the most reactive elements.
  7. Group 2 consists of?
    Alkaline earth metals. They are very reactive but not as reactive as alkali metals.
  8. Groups 3-12 contain?
    Transition metals. They are less reactive then the metals in group 1 and 2.
  9. Group 13 to 16 contain?
    At least one metalloid. They also contain metals and or non  metals. They vary in reactivity.
  10. Group 17 contains?
    Halogens. They are highly reactive nonmetals.
  11. Group 18?
    Contains noble gases. They are unreactive and rarely combine with other elements.
  12. Halogens?
    Elements in group 17.
Card Set