Chemical Interactions - Inv. 1 & 2

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Across
  1. 5. The number of protons and electrons equals an atoms ______.
  2. 6. The smallest piece of an element.
  3. 8. How many electrons does an oxygen atom have?
  4. 11. An interaction during which starting substances change into new substances.
  5. 14. Positively charged particles of an atom.
  6. 15. An organized table of the elements.
  7. 17. How many neutrons does a lithium atom have?
Down
  1. 1. Mendeleyev arranged elements on the periodic table according to their ______.
  2. 2. This scientist created the first periodic table.
  3. 3. One way that a substance can be described.
  4. 4. A type of matter defined by a unique particle.
  5. 7. How many protons does an atom of aluminum have?
  6. 9. Negatively charges particles of an atom.
  7. 10. Particles in an atom with no charge.
  8. 12. The element that is represented by the substance Mg.
  9. 13. The part of an atom containing protons and neutrons.
  10. 16. One way you know a chemical reaction has occurred.