Periodic Table Crossword Puzzle

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Across
  1. 2. The _______ number is the sum of the protons and neutrons
  2. 4. Most elements are ________
  3. 8. Name for the Group 2 metals
  4. 10. A positive ion
  5. 11. Name for the Group 1 metals
  6. 13. The _______ gases are considered fairly non-reactive
  7. 14. An element's atomic number is the number of _______ each atom has
  8. 15. The most reactive nonmetal group
Down
  1. 1. The vertical columns are called _______ or families
  2. 2. An element that has metallic and nonmetallic properties is called a _______
  3. 3. The ______ metals are the elements in the middle of the periodic table
  4. 5. When an atom becomes positive it ________ electrons
  5. 6. When an atom becomes negative it _______ electrons
  6. 7. The horizontal rows are known as ________
  7. 9. This type of electron is located in the outermost energy level of an atom
  8. 12. A negative ion