Atoms, Isotopes, Trends in Periodic Table

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