Atomic Structure Physical Science

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Across
  1. 6. Positively charged particle inside nucleus of atom
  2. 9. 15th column with 5 valence electrons
  3. 11. 18th group with 8 valence electrons
  4. 12. Well defined area in which electrons orbit
  5. 13. Same number protons different number of neutrons
  6. 14. Vertical columns on the periodic table
  7. 16. 14th column with 4 valence electrons
  8. 17. Electrons in outermost energy level of atoms
  9. 19. 17th group with 7 valence electrons
  10. 20. Elements found in columns 3 - 12
Down
  1. 1. 13th column with 3 valence electrons
  2. 2. 1st column with one valence electron
  3. 3. Number of protons OR Electrons in an atom
  4. 4. Weighted average mass of all isotopes
  5. 5. Negatively charged particle that orbits atoms
  6. 7. 16th group with 6 valence electrons
  7. 8. Number of protons AND neutrons in an atom
  8. 10. 2nd column with two valence electrons
  9. 15. Horizontal rows on the periodic table
  10. 18. Neutrally charged particle inside nucleus of atom