Chemistry

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Across
  1. 5. A substance that consists of atoms that all have the same number of protons
  2. 7. Neutral charge (no charge) Mass 1
  3. 9. Ability to react with other elements
  4. 10. The electrons in the energy level
Down
  1. 1. Anything that has mass and takes up space (has volume)
  2. 2. Positive charge Mass of 1
  3. 3. Negative charge Mass of 0
  4. 4. Was developed based on the physical and chemical properties of the known elements
  5. 6. The Smallest unit of matter
  6. 8. Center of a atom