Chemistry Crossword Puzzle

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Across
  1. 4. Vertical columns on the periodic table
  2. 5. metals Group 3-12 on the periodic table
  3. 8. metals Very reactive elements
  4. 10. Poor conductors of electricity and heat
Down
  1. 1. nonmetals that are very reactive, group 7 on the periodic table
  2. 2. mass unit Tells you the average mass of all the isotopes of the element mass number Is the total of protons and neutrons
  3. 3. Atoms of an element with different amounts of neutrons are called:_____
  4. 6. gases nonmetals that are unreactive, group 18 on the periodic table
  5. 7. earth metals Hard and dense elements that melt at higher temperatures
  6. 9. The horizontal rows in the periodic table