Elements, Molecules, and Compounds

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Across
  1. 2. the shells where electrons orbit the nucleus
  2. 6. electrons located in the outermost energy level of an atom
  3. 8. the center of an atom which contains neutrons and protons
  4. 11. the negatively charged particle in an atom
  5. 12. molecule that contains carbon-hydrogen bonds
  6. 15. a charged atom or molecule
  7. 17. the positively charged particle in an atom
  8. 20. a visual representation of the elements and the bonds between them
  9. 21. a molecule that emits radiation
  10. 22. two or more elements
  11. 23. equals the sum of protons and neutrons
  12. 25. mass can change from one form to another but the total amount of mass remains constant
Down
  1. 1. type of bond formed when electrons are shared
  2. 3. a diagram that indicates the number of valence electrons in an atom
  3. 4. a pure substance that cannot be reduced into a simpler substance
  4. 5. the particle in an atom having no charge
  5. 7. a chart that displays elements and is organized by the number of protons (horizontally) and valence electrons (vertically)
  6. 9. type of molecule that has a ring structure
  7. 10. element symbols and numbers that indicate the 'recipe' to create a molecule
  8. 13. variations of the same element
  9. 14. substances made up of carbon and hydrogen atoms
  10. 16. represents the number of protons in an atom
  11. 18. type of bond formed when electrons are transferred
  12. 19. the basic unit of matter
  13. 24. two or more atoms