chemistry

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Across
  1. 2. I am a stable element with 18 protons
  2. 4. I have a mass less than 1 amu
  3. 6. I have 7 protons
  4. 10. I have 6 valence electrons and 3 shells
  5. 13. this subatomic particle is located outside nucleus
  6. 14. makes up most of the mass in an atom
  7. 16. I am stable despite not having 8 valenece electrons
Down
  1. 1. charge of a proton
  2. 3. I am a metaloid with same shells as carbon
  3. 5. I have 10 protons
  4. 6. charge of a neutron
  5. 7. I have 6 valence electrons and 2 shells
  6. 8. I determine the identity of an elements atom
  7. 9. I have 2 valence electrons and 3 shells
  8. 11. I react similar to Sodium but I have less protons
  9. 12. charge of an electron
  10. 15. I also have a mass of 1 amu