Chap. 5 Test Review-Periodic Table

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Across
  1. 4. 1/12th the mass of a Carbon-12 atom is defined as an atomic ______ ______.
  2. 5. Moving from left to right across a row of the Periodic Table,on sees an increasing value in the _______
  3. 6. Atoms of the most reactive elements tend to have one or ________ valence electrons.
  4. 8. The unit for atomic mass is __ __ __.
  5. 11. To keep them from reacting, some highly reactive elements are stored in the Noble Gas __________.
  6. 13. At room temperature, all metals are solids or __________.
  7. 14. from element to element.
  8. 15. The ______ gases emit colors when an electric current is applied.
Down
  1. 1. A horizontal row on the Periodic Table is called a __________.
  2. 2. Mendeleev arranged the known chemical elements in a table according to increasing atomic _______.
  3. 3. The ability of metals to be drawn into wires.
  4. 7. The usefulness of Mendeleev's Periodic Table was confirmed by the discovery of undiscovered _________ with predicted properties.
  5. 9. A vertical column on the table is called a _______.
  6. 10. The ability of metals to bend and not break.
  7. 12. Unlike the Halogens, the Noble Gases are very ___-________.