chemistry

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Across
  1. 3. to be hammered into thin sheets
  2. 6. outer layers of atom made up of energy levels
  3. 9. anything that has mass and takes up space
  4. 10. positive charge, mass of 1 amu
Down
  1. 1. the smallest unit of matter
  2. 2. a substance that consists of atoms that all have the same number of protons
  3. 4. ability to reflect light
  4. 5. a substance composed of two or more elements
  5. 7. ability to react with other elements
  6. 8. center of the atom