Chemistry

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Across
  1. 4. 6.02 x 10^23
  2. 7. the simplest structural unit of an element or compound
  3. 8. arrangement of chemical elements according to atomic number
  4. 9. anything that takes up space and can be weighed
  5. 10. the metals of group I of the periodic table
Down
  1. 1. a type of reaction in which multiple reactants combine to form a single product
  2. 2. atoms of two or more different elements joined by chemical bonds
  3. 3. an electron in the outer shell of an atom which can combine with other atoms to form molecules
  4. 5. containing or involving electrically charged particles
  5. 6. occurring or formed with the release of heat
  6. 11. the mass of an atom of a chemical element expressed in atomic mass units.