Crossword puzzles about matter, atoms, and molecules

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Across
  1. 3. A state of matter where particles spread out.
  2. 6. A pure substance made of only one type of atom (like Oxygen).
  3. 8. Two or more atoms joined together (e.g., water).
  4. 9. Two or more substances combined but not chemically bonded (like salt water).
  5. 10. A positive particle in the atom's center (nucleus).
  6. 11. A state of matter that flows and takes the shape of its container.
Down
  1. 1. A state of matter that has a definite shape.
  2. 2. Anything that has mass and takes up space.
  3. 4. A negative particle that orbits the nucleus.
  4. 5. The basic building block of all matter.
  5. 7. A particle in the nucleus with no charge.