PERIODIC TABLE YOU GOTTA LUV IT

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Across
  1. 2. A term meaning the number of outer shell electrons
  2. 4. Atoms of the same element with different masses
  3. 6. Lightest element on the periodic chart
  4. 9. Place where electrons orbit the nucleus
  5. 10. The average mass of an element
  6. 11. A horizontal row on the periodic chart
  7. 13. The sum of protons and neutrons
Down
  1. 1. A vertical column on the periodic chart
  2. 3. The number of protons in an atom
  3. 5. Most stable number of outer shell electrons
  4. 7. Elements that do not chemically react with other elements
  5. 8. Positively charged particle in the nucleus
  6. 12. Negatively charged particle which orbits around the nucleus
  7. 14. The abbreviation for an element
  8. 15. Particle with no charge in the nucleus