Across
- 3. same # protons; neutrons not same #
- 5. energy required to remove valence electron
- 7. smallest subatomic particle
- 10. gains electrons easily
- 14. positive charged subatomic particle
- 15. weighted average of mass numbers of isotopes
- 17. Sodium has ___ valence electron(s)
- 18. elements to right of zigzag line are
- 22. He is chemical symbol for __
- 24. energy needed to remove valence electron is
- 25. Group 2A, period 3
- 28. atomic size increases ___ a group
- 29. loses electrons easily
Down
- 1. Mn is chemical symbol for __
- 2. # of protons
- 4. subatomic particle with no charge
- 6. Group 8A elements are ___ gases
- 8. has electron arrangement 2,8,8,2
- 9. has electron arrangement 1
- 11. Na is chemical symbol for__
- 12. protons + neutrons
- 13. Nitrogen has ___ valence electrons
- 15. Group 1A elements are ___ metals
- 16. has electron arrangement 2,8,5
- 17. Group 6A, period 2
- 19. negative charged subatomic particle
- 20. another name for electron dot symbol
- 21. K is chemical symbol for __
- 23. elements to the left of zigzag line are
- 26. Group 3A, period 3
- 27. Co is chemical symbol for__
- 30. Group 2A elements are ___ earth metals