Chapter 9-Conner Hewson

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Across
  1. 4. Average mass of the naturally occurring isotopes of an element.
  2. 5. Any of the possible energies an electron may have in an atom.
  3. 7. Number of protons
  4. 9. One less electron than proton = (+) positive charge
Down
  1. 1. Two atoms with different numbers of neutrons.
  2. 2. Electrons in the outermost energy level of an atom.
  3. 3. One more electron than proton = (-) negative charge.
  4. 6. Tiny particles that have a negative electrical charge
  5. 7. Equal to the number of protons plus neutrons.
  6. 8. An atom that carries an electrical charge is called an