Chemistry!!

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Across
  1. 2. the number of neutrons in a Silicon atom with a mass of 28
  2. 4. the charge on an atom that has lost electrons
  3. 6. a positively charged ion
  4. 7. The element with the atomic mass of 87.62 (approx)
  5. 10. the number of protons in a lithium ion
  6. 11. the group of elements that are most stable (just the first word)
  7. 12. the number of electrons on the element B if it has a charge of -2
Down
  1. 1. the charge on an atom that has gained electrons
  2. 3. The element with 22 electrons when in a stable (non-ionic) form
  3. 5. a negatively charged ion
  4. 8. the number of protons in a Magnesium ion that has a charge of +2
  5. 9. the outer shell of electrons on an atom