Alexa's Chemistry Bonus Puzzle

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Across
  1. 2. a neutral particle having equal numbers of protons and electrons
  2. 5. how close a measured value is to an accepted value
  3. 8. a way to convert measurements to a different unit.
  4. 9. atoms of the same element with different amount of neutrons
  5. 13. how close a series of measurements are to each other
  6. 15. number of protons in the nucleus
  7. 17. the measure of kinetic energy in a sample of matter
  8. 19. study of how heat is converted to and from other forms of energy
  9. 20. Has a Ph level less than 7
  10. 21. time it takes for half of the radioactive atoms of a specific radioactive isotope to decay
Down
  1. 1. the mass of an atom given in amu
  2. 3. standard unit that stands for 6.02 x 10^23
  3. 4. the concave surface of a liquid
  4. 6. positively charged ion
  5. 7. created the 1st periodic table
  6. 10. A reaction where heat is absorbed
  7. 11. A reaction where heat is released
  8. 12. a ratio that compares the mass of an object to its volume
  9. 14. atoms that have either gained or lost electrons so that it is no longer electrically neutral
  10. 16. the change in heat of the products from the reactants
  11. 18. Has a Ph level higher than 7