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