Chapter 7 - Atoms and Molecules

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Across
  1. 6. molecules formed from two or more different elements
  2. 8. using the pH _____ will tell you if a substance is an acid or a base
  3. 10. has no charge; located in the nucleus
  4. 11. a substance that changes color when exposed to acid or base solution
  5. 12. a reaction between an acid and a base can form a ______
  6. 14. abbreviations for the names of elements are chemical ____
  7. 15. the atoms share ______ in a covalent bond
  8. 17. formed when atoms combine
  9. 18. chemical _____: process in which different types of atoms join and form a new substance
  10. 21. reaction in which a compound is broken down into simpler compounds
  11. 22. protons plus neutrons will give you the atomic ____
  12. 24. developed the model of the atom
Down
  1. 1. developed the periodic table of elements
  2. 2. has a negative charge; travels around the nucleus
  3. 3. has a positive charge; located in the nucleus
  4. 4. an atom that has gained or lost electrons
  5. 5. symbols and numbers abbreviating the names of a compound make a chemical _____
  6. 7. horizontal rows of the periodic table
  7. 8. kind of reaction in which molecules combine to form a new substance
  8. 9. an ionic bond forms when positively and negatively charged ions ____ each other
  9. 13. atoms bond with other atoms to complete their outer ____
  10. 16. center part of an atom
  11. 19. the study of matter
  12. 20. vertical columns of the periodic table
  13. 23. smallest piece of an element that can be recognized as that element