science

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Across
  1. 3. a stable subatomic particle occurring in all atomic nuclei
  2. 8. an element or substance that is not a metal
  3. 11. a stable subatomic particle with a charge of negative electricity
  4. 14. a notation of one or two letters representing a chemical element
  5. 15. the number of protons in the nucleus of an atom
  6. 16. lacking a response or reaction to a stimulus
Down
  1. 1. any of the gaseous elements helium, neon, argon, krypton, xenon, and radon,
  2. 2. solid, liquid, or gas
  3. 4. showing response to a stimulus
  4. 5. the combining power of an element, especially as measured by the number of hydrogen atoms it can displace or combine with
  5. 6. the mass of an atom of a chemical element expressed in atomic mass units
  6. 7. the positively charged central core of an atom
  7. 9. an expression that shows the elements in a compound and the relative proportions of those elements
  8. 10. hard, ductile, and a good conductor
  9. 12. a subatomic particle of about the same mass as a proton but without an electric charge
  10. 13. a collection of all the elements