Chemistry

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Across
  1. 4. a charge of negative electricity, found in all atoms and acting as the primary carrier of electricity in solids.
  2. 7. electron in the outer most shell
  3. 10. a+b=ab
  4. 12. ab=a+b
Down
  1. 1. ab+cd=ac+bd
  2. 2. ab+c=ac+b
  3. 3. outer most shell
  4. 5. particle that has a positive charge equal in magnitude to a unit of electron charge
  5. 6. the positively charged central core of an atom, consisting of protons and neutrons and containing nearly all its mass.
  6. 8. any particle of matter at its most basic level which contains at least one proton
  7. 9. neutral subatomic particle
  8. 11. outer most part of the atom