Chemistry Crossword Puzzle

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Across
  1. 3. the electrons in the outer most energy level of an atom
  2. 5. a neutral group of atoms held together by a covalent bond
  3. 6. elements that have properties of both nonmetals and metals
  4. 7. having a regular, repeating pattern
  5. 9. a column of elements on the periodic table
  6. 10. the simplest molecules, consisting of two atoms bonding together
  7. 13. made up of protons and neutrons, brain of a cell
  8. 14. elements that are dull and poor conductors or thermal energy
  9. 17. a pure substance that can't be separated or broken down into simpler substances
  10. 18. charged particles that form during chemical changes
  11. 19. the positively charged particles of the nucleus
Down
  1. 1. a representation of an object
  2. 2. the smallest particle into which an element can be divided and still be the same substance
  3. 4. a short representation of a chemical element
  4. 7. the substances formed from a chemical reaction
  5. 8. the starting materials in a chemical reaction
  6. 11. a substance that speeds up a reaction without being permanently changed
  7. 12. elements that are shiny and are good conductors of thermal energy and electric current
  8. 15. the forming of building a more complex substance or compound form elements or simpler compounds
  9. 16. a horizontal row of elements on the periodic table