Elements, Periodic Table, and Bonding

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Across
  1. 5. nuclear particle with positive charge
  2. 7. an electron donor
  3. 11. substance that cannot be broken down chemically into simpler substances
  4. 13. can either accept or donate electrons, as needed
  5. 14. a charged atom
  6. 16. tendency for an element to form bonds with another
  7. 19. an electron acceptor
  8. 20. variants of an element with different numbers of neutrons
  9. 21. formed when one or more atoms bond together
  10. 22. type of bond formed by sharing electrons
  11. 23. creator of the Periodic Table of the Elements
Down
  1. 1. vertical column on the Periodic Table
  2. 2. unreactive, as in the Noble Gases
  3. 3. smallest unit of matter with unique properties
  4. 4. number of protons plus neutrons
  5. 6. nuclear particle with no net charge
  6. 8. energy level occupied by electrons
  7. 9. formed by exchange or sharing of electrons
  8. 10. horizontal row on the Periodic Table
  9. 12. number of protons in the nucleus
  10. 15. negatively charged subatomic particle
  11. 17. substance formed by chemical combination of 2 or more elements
  12. 18. type of bond formed by accepting or donating electrons