Periodic table Review

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Across
  1. 3. the neutral particle in the nucleus with no charge
  2. 4. Group 18 gasses that are stable with full energy levels
  3. 6. electrons found in the outermost energy level, responsible for bonding
  4. 7. the number of protons in an element
  5. 9. the number of protons plus neutrons
  6. 11. the negative particle found outside the nucleus in the cloud in orbital levels
  7. 12. an element with a different number of protons and electrons
Down
  1. 1. group 17 and second most reactive elements in the Periodic table
  2. 2. group 1 and most reactive group of elements
  3. 5. center of the atom containing the protons and neutrons
  4. 8. an element with a different number of NEUTRONS
  5. 10. the positive particle in the nucleus which determines the element