Science vocab

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Across
  1. 3. a positively charged subatomic particle
  2. 4. the system of electrons surrounding the nucleus of an atom
  3. 7. a collection of protons and neutrons in the center of a atom
  4. 8. how much space a object takes up
  5. 12. the mass of a atom
  6. 14. a chemist who created the periodic table
  7. 15. the number of protons found in the nucleus
Down
  1. 1. a product composed of two or more elements
  2. 2. the display of chemical elements
  3. 5. a state of matter that takes shape of its container
  4. 6. a state of matter with no fixed shape or volume
  5. 9. a pure substance
  6. 10. the structure of atoms
  7. 11. a subatomic particle with no or neutral charge
  8. 12. a very small unit that forms chemical elements a group of atoms bonded together
  9. 13. a state of matter with tightly packed molecules