Periodic Table Review

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Across
  1. 4. particle with no charge in the nucleus
  2. 6. vertical arrangement of elements, share valence electrons
  3. 7. elements that are not metals
  4. 11. another word for group
  5. 12. number of groups
  6. 13. increasing, how the entire periodic table is organized, also number of protons
  7. 16. the abbreviation of an element on the periodic table
  8. 17. horizontal arrangement of elements, share same number of energy shells
  9. 18. number of periods
Down
  1. 1. the levels where electrons are located
  2. 2. represents the 'weight' of an atom
  3. 3. negatively charges particle not in the nucleus
  4. 5. group 1 metals, alkali metals
  5. 7. center of atom with protons and neutrons
  6. 8. electrons in the outermost energy shell
  7. 9. positively charged particle in the nucleus
  8. 10. share characteristics of metals and non-metals
  9. 14. the chart that organizes all the elements
  10. 15. group on the far right of the periodic table