chemistry crossword puzzle

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Across
  1. 3. any of a class of chemical reactions in which an atom or group of atoms is added to a molecule
  2. 5. the lowest energy state of an atom or other particle
  3. 8. the transition of a substance directly from the solid phase to the gas phase without passing through the intermediate liquid phase
  4. 9. a stable subatomic particle with a charge of negative electricity, found in all atoms and acting as the primary carrier of electricity in solids
  5. 12. expresses the amount of a substance present in a mixture
  6. 14. made up of one or more atoms
  7. 17. a substance that has a bitter taste and reacts with an acid to form a salt
  8. 18. a covalent linkage in which two atoms share three pairs of electrons
  9. 20. something formed by a union of elements or parts
  10. 21. any substance that cannot be decomposed into simpler substances by ordinary chemical processes
  11. 22. any atom or group of atoms that bears one or more positive or negative electrical charges
Down
  1. 1. the quantity of matter contained in an atom of an element
  2. 2. atom or group of atoms that bears a positive electric charge
  3. 4. a substance that enters into and is altered in the course of a chemical reaction
  4. 6. a dynamic state where the concentration of all reactants remains constant
  5. 7. the mass of one mole of a substance
  6. 10. a chemical property that describes the tendency of an atom or a functional group to attract electrons toward itself
  7. 11. stable subatomic particle that has a positive charge equal in magnitude to a unit of electron charge
  8. 13. elements on the right of the periodic table
  9. 15. a measure of the average kinetic energy of the atoms or molecules in the system
  10. 16. any of the five elements fluorine, chlorine, bromine, iodine, and astatine
  11. 19. the number of a chemical element in the periodic system, whereby the elements are arranged in order of increasing number of protons in the nucleus