Chemistry

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Across
  1. 1. anything with mass and volume
  2. 4. process by which unstable atoms eject particles until they become stable
  3. 6. measurement of the average motion of the particles in a substance
  4. 8. an atom with a charge
  5. 9. the most abundant element in the universe
  6. 16. most elements in the human body are these
  7. 17. the hottest state of matter
  8. 18. most elements on the periodic table are these
  9. 20. several atoms bonded together
  10. 23. the study of atoms and their behavior
  11. 25. particle in atoms with no charge
  12. 26. chemical reaction where a fuel combines with oxygen to produce water and carbon dioxide
  13. 27. a species of atom with a certain number of protons
Down
  1. 2. the number of electrons the first energy level can hold
  2. 3. the basic building block of matter
  3. 5. a version of an element with a certain number of neutrons
  4. 7. chemical reaction in which energy is released
  5. 10. positive particle in atoms
  6. 11. the center of an atom
  7. 12. the amount of space something takes up
  8. 13. the study of life
  9. 14. bond where atoms share electrons
  10. 15. the most important element for life
  11. 19. when an atom splits into two smaller atoms
  12. 21. when two atoms combine to make a larger atom
  13. 22. bond where one atom gives electrons to another
  14. 24. negative particle in atoms