Atoms & Molecules

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Across
  1. 2. ____ number; the sum of protons and neutrons in an atom
  2. 5. Negatively charged ion
  3. 6. Type of bond where electrons are shared
  4. 7. Weak or strong electrical attraction between atoms
  5. 10. A form of the same element with a different number of neutrons
  6. 12. Represented by the chemical symbol "K"
  7. 13. Positively charged ion
Down
  1. 1. Outermost shell or outermost electrons
  2. 3. Anything that occupies space and has mass
  3. 4. Represented by the chemical symbol "Na"
  4. 8. Subatomic particle with no charge
  5. 9. Type of bond between oppositely charged ions
  6. 11. Element that makes up about 65% of the human body
  7. 12. Molecule with regions that have opposite electrical charges