Matter and Chemistry

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Across
  1. 2. A substance that cannot be broken down into simpler substances by chemical means
  2. 5. The electrons in an atom's outermost electron shell
  3. 8. one of the three subatomic particles that make up an atom
  4. 9. a mixture in which the composition is not uniform throughout the mixture
  5. 14. a subatomic particle with a positive electrical charge
  6. 15. equal to the number of protons in the nucleus of an atom or the number of electrons in an electrically neutral atom
  7. 16. the membrane-enclosed organelle within a cell that contains the chromosomes
  8. 18. the point at which materials changes from a solid to a liquid
  9. 19. neither solids nor gases
  10. 21. organizes all discovered chemical elements in rows (called periods) and columns (called groups) according to increasing atomic number
  11. 22. the total mass of particles of matter in an atom
Down
  1. 1. a row of chemical elements
  2. 3. a negatively charged subatomic particle that can be either bound to an atom or free (not bound)
  3. 4. a substance that is in a gaseous, or vaporous, state of matter
  4. 6. a material formed by chemically bonding two or more chemical elements
  5. 7. solid, liquid, gas, and plasma
  6. 10. firm and stable in shape; not liquid or fluid
  7. 11. the temperature at which its vapor pressure is equal to the pressure of the gas above it
  8. 12. a group of elements that have certain similar properties and can form compounds with some similar properties
  9. 13. a mixture in which the composition is uniform throughout the mixture
  10. 17. capable of being dissolved in a liquid
  11. 18. two or more substances that are mixed together but not chemically combined and that may vary in proportion
  12. 20. a particle of matter that uniquely defines a chemical element