Periodic Table Vocabulary

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Across
  1. 2. all nonmetals very reactive. poor conductors of heat and electricity tend to form salts with metals (7 outer level electrons)
  2. 5. The average mass of all the isotopes of an element
  3. 7. Groups 3-12, 1-2 electrons in the outer energy level, less reactive than alsali-earth metals, shiny, good conductor of thermal energy and electrical current, high density
  4. 9. metallic elements in group 2 of the periodic table which are harder than the alkali metals and are also less reactive
  5. 11. electrons in the outermost shell
  6. 12. vertical columns on the periodic table
  7. 13. gasses Elements in group 8A of the periodic table. Have no charge and are gases under normal conditions.
Down
  1. 1. Group 1, 1 electron in outer level, very reactive, soft, silver, shiny, low density
  2. 3. Horizontal rows on the periodic table
  3. 4. the property that describes how readily a substance combines chemically with other substances
  4. 6. Elements that have properties of both metals and nonmetals
  5. 8. Elements that are not metals, poor conductors of heat and electric current
  6. 10. the number of protons in an atom