Chemical Formulas & Periodic Table

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Across
  1. 2. substances formed in a chemical reaction
  2. 4. matter is neither created or destroyed in ordinary chemical and physical changes
  3. 9. group 17 liquid with mass number 79.9
  4. 11. law that states energy cannot be created or destroyed
  5. 13. expression that shows starting substances and those produced by a chemical reaction
  6. 16. an interaction that holds atoms together
  7. 17. a reaction that requires an input of energy
  8. 19. elements that dull and brittle and poor conductors
Down
  1. 1. symbols and numbers that represent a substance
  2. 3. that participate in a chemical reaction
  3. 5. elements that have properties of metals and nonmetals
  4. 6. a reaction that releases energy
  5. 7. a substance that changes the rate of a reaction without being used up
  6. 8. horizontal rows on the periodic table
  7. 10. vertical columns on the period table, like Noble Gasses
  8. 12. electrons in outer shell of atom
  9. 14. Scientist that developed the current periodic table
  10. 15. a charged atom having more or less electrons than protons
  11. 18. elements that are shiny and good conductors