Periodic Table

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Across
  1. 5. the metallic elements within groups 3 and 12 in the periodic table
  2. 7. the elements that are good conductors of heat and electricity
  3. 10. avg mass of all isotopes of that element
  4. 11. this element is in the first period and has an atomic number of 1
  5. 12. the soft metal elements in group 1 that are very reactive in water
  6. 14. the primary creator of the first version of the periodic table
  7. 15. the non-flammable, odorless, and nonreactive elements in group 18
Down
  1. 1. abbreviations used in chemistry for chemical elements
  2. 2. the elements in group 2 that are somewhat soft and reactive
  3. 3. a horizontal row of elements in the periodic table
  4. 4. a vertical column of elements in the periodic table
  5. 6. the name of elements that do not have properties of a metal
  6. 8. number of protons in an atom
  7. 9. matter made up of one kind of atom
  8. 11. the nonmetallic elements in group 17 that have colored vapors
  9. 13. elements such as boron and silicon that are neither metals nor nonmetal