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