Atoms, periodic table, and chemistry

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Across
  1. 4. electrons in the outermost shell
  2. 6. (S) 16 protons, and electrons
  3. 7. (Na) has 11 protons, and electrons
  4. 11. substances that are the building block if all matter
  5. 12. A substance made up of atoms of two or more different elements joined by chemical bonds
  6. 13. (H) 1 proton, and electron
Down
  1. 1. A horizontal row of elements in the periodic table
  2. 2. A subatomic particle that has a negative charge
  3. 3. particle with a positive charge
  4. 5. the smallest particle in an element
  5. 8. an element that is shiny and that conducts heat and electricity well
  6. 9. an element that has properties of both metals and nonmetals
  7. 10. A subatomic particle that has no charge and that is found in the nucleus of an atom
  8. 12. symbol A one or two letter representation of an element
  9. 14. A column on the periodic table