Matter, Elements Molecules, and Compounds

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Across
  1. 2. When two hydrogen atoms combine with one oxygen atom
  2. 4. The smallest piece of an element that still has the properties of that element
  3. 6. A gas that we can't see, hear, smell, taste, or feel.
  4. 8. The lightest substance on Earth
  5. 9. The stuff that makes up everything in the universe
  6. 10. Elements are called "_____" substances
Down
  1. 1. abbreviations for elements, molecules, and compounds
  2. 3. When all atoms that make up a substance are the same
  3. 5. Formed when two or more atoms join together chemically
  4. 7. If atoms combine that are of two or more different elements