Chemistry Crossword Puzzle

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Across
  1. 5. the smallest unit of an element
  2. 6. formula a combination of chemical symbols that represents the elements in a compound
  3. 8. Atoms of the same element with a different number of neutrons
  4. 10. negatively charged subatomic particle orbiting the nucleus of an atom
  5. 11. positively charged subatomic particle found in the nucleus of an atom
  6. 12. mass per unit volume of a substance
  7. 13. subatomic particle with no charge, found in the nucleus of an atom
  8. 14. the process of a substance changing directly from a solid to a gas without passing through the liquid phase
  9. 17. a substance that speeds up a chemical reaction without being consumed in the process
  10. 18. an atom or molecule with a net electric charge due to the loss or gain of one or more electrons
Down
  1. 1. the speed at which a chemical reaction occurs
  2. 2. an electron in the outermost shell of an atom, involved in chemical bonding
  3. 3. A substance made up of two or more different types of atoms chemically bonded together
  4. 4. a measure of the acidity or alkaline concentration.
  5. 7. the amount of solute dissolved in a solvent
  6. 9. A substance made up of only one type of atom
  7. 15. point the temperature at which a liquid turns into a gas
  8. 16. a group of atoms bonded together