MS-PS1-1

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Across
  1. 2. +1, 0 -1
  2. 4. The center
  3. 7. Arrangement, ratio, type
  4. 8. Negative
  5. 11. Positive
  6. 12. The rings
  7. 14. The size of an atom
Down
  1. 1. Like Cl or He
  2. 3. Neutral
  3. 5. Smaller than an atom
  4. 6. Unequal protons and neutrons
  5. 9. Unequal protons and electrons
  6. 10. Microscopic unit
  7. 13. Twice the atomic number