Matter Crossword Puzzle

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Across
  1. 2. Ionized gas consisting of approx. equal numbers of positive charged ions and negative charged electrons
  2. 3. A number of people or things that are put together
  3. 6. Particle with a charge of negative electricity
  4. 8. Particle of about the same mass as protons
  5. 9. A solid material that is typically hard, shiny and durable
  6. 10. An element whose properties are intermediate between metals and non-metals
  7. 12. A substance made by mixing other substances together
  8. 13. Everything in the universe that has mass and volume is made of this
  9. 15. A thing that is composed of two or more elements
  10. 16. Number of protons in the nucleus of an atom
Down
  1. 1. Substance that cannot be chemically broken down
  2. 4. Table arrangement of chemical elements, ordered by atomic number
  3. 5. A group of atoms bonded together
  4. 7. Notation of one or two letters representing a chemical element
  5. 11. A substance that flows freely, having a consistency like water
  6. 14. Having 3- dimensions; a shape