chemistry vocabulary

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Across
  1. 3. number of protons and neutrons in the atom
  2. 4. tells us the number of protons in the atom
  3. 5. horizontal rows on the Periodic Table
  4. 6. describes a material that is bendable
  5. 8. atoms of the same element with different neutrons
  6. 10. an element used in electrical circuits
  7. 13. electrons in the outermost shell
  8. 14. category of atoms with the same atomicnumber
Down
  1. 1. identifies which element the atom is
  2. 2. contains protons and neutrons and electrons
  3. 3. the mass of the atom
  4. 7. smallest unit of matter
  5. 9. vertical columns on the Periodic Table
  6. 11. area around where electrons orbits
  7. 12. anything that has mass and takes up space