Crossword on Chemistry

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Across
  1. 5. A subatomic particle with a positive charge
  2. 7. Any form of a certain element that contains different numbers of neutrons than the other versions
  3. 9. Creator of the first version of the periodic table
  4. 11. The group of elements that are highly reactive
  5. 12. A representation of a chemical reaction
  6. 13. mass The sum of the numbers of protons and neutrons in an atom
  7. 14. A substance that changes the rate or a chemical reaction
  8. 15. A group of atoms held together by bonds
  9. 16. A reaction in which one or more substances combine to form a new one
  10. 18. A homogeneous mixture
  11. 21. When two or more atoms join together, they form _______
  12. 22. A substance that has only one particle is referred to as a ______ substance
  13. 23. A particle that has gained or lost an electron
Down
  1. 1. The substance will remain the same through a __________change
  2. 2. A combination of chemical symbols and numbers
  3. 3. A substance that forms in a chemical reaction
  4. 4. The particle of an element
  5. 6. An element that loses electron/s when forming bonds
  6. 8. A mixture where the components are easily seen, and are able to be physically separated
  7. 10. A subatomic particle with a negative charge
  8. 14. A change where the substance/s themselves are changed
  9. 17. The subatomic particle that has no charge
  10. 19. This is the eighth element on the periodic table
  11. 20. Helium, neon, and krypton belong in this group of elements