Chapter 9-Kamryn Merrill

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Across
  1. 3. average mass of an element
  2. 5. an atom that carries an electrical charge is called an
  3. 6. tiny light particles that have a negative charge
  4. 7. number of protons
  5. 9. no electrical charge and located in the nucleus of an atom
  6. 10. large and heavy with a positive charge
Down
  1. 1. an electron in the outermost energy level of an atom
  2. 2. one less electron than proton
  3. 4. one more electron than proton
  4. 8. two atoms with different numbers of nuetrons are called