Chemistry Extra Credit

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Across
  1. 2. part of the atom where protons and neutrons are found
  2. 4. electrons found in the outer shell of an atom
  3. 6. the small numbers in a chemical formula that cannot be changed
  4. 10. the large number in front of a chemical formula that is used to balance a chemical equation
  5. 11. unit of measurement is g/mL or g/cm3, measures how tightly packed particles are
  6. 12. mass cannot be created or ( ) in a chemical reaction
  7. 16. Has an atomic mass of about 27 and is in group 13
  8. 17. element with 15 protons, 15 electrons, 16 neutrons
  9. 21. reaction that releases heat and feels hot
  10. 22. Substance with a low pH due to a high concentration of H+
  11. 23. post-transition metal that has 50 protons and 50 electrons
Down
  1. 1. Has 4 valence electrons and an atomic mass of 12.011
  2. 3. Symbol is Co
  3. 5. A liquid transition metal with 80 protons
  4. 7. element in group 1 with 20 neutrons
  5. 8. Only element with 0 neutrons
  6. 9. type of mixture where the substances are not evenly mixed
  7. 13. element found in table salt and swimming pools
  8. 14. water ( ), used to find the volume of an irregularly shaped object
  9. 15. Substance with a high pH due to a high concentration of OH-
  10. 18. Noble Gas with 2 protons
  11. 19. starting substances in a chemical reaction (like the ingredients)
  12. 20. Symbol is Na