Atomic Structure & Periodic Trends Crossword

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Across
  1. 3. A horizontal row in the periodic table
  2. 6. An element that is a good conductor of electricity and heat
  3. 7. Positively charged subatomic particle
  4. 11. Atoms of the same element with different mass numbers
  5. 12. Highly reactive metals in Group 1
  6. 13. Number of protons in an atom
  7. 14. Distance from nucleus to the outermost electron shell
  8. 15. Highly reactive nonmetals in Group 17
  9. 18. Energy required to remove an electron from an atom
  10. 20. Sum of protons and neutrons in an atom
  11. 22. Elements in the d-block with variable oxidation states
  12. 23. Atom that has gained or lost electrons
  13. 24. Neutral subatomic particle
  14. 25. Group 18 elements with full outer shells
Down
  1. 1. Ability of an atom to attract electrons in a bond
  2. 2. s, p, d, or f regions within an energy level
  3. 4. Arrangement of electrons in an atom
  4. 5. Electrons in the outermost shell
  5. 8. Pattern observed in properties across a period or group
  6. 9. A positively charged ion
  7. 10. Negatively charged subatomic particle
  8. 16. An element with properties of both metals and nonmetals
  9. 17. An element that is a poor conductor of heat and electricity
  10. 19. A negatively charged ion
  11. 21. A vertical column in the periodic table