chemistry final crossword

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Across
  1. 5. a subatomic particle of about the same mass as a proton but without an electric charge,
  2. 6. The photon is a type of elementary particle
  3. 7. chemical element of atomic number 2
  4. 9. payload is the carrying capacity of an aircraft or launch vehicle,
  5. 10. Nuclear Fission: is a process in nuclear physics in which the nucleus of an atom splits into two or more smaller nuclei as fission products,
  6. 11. a series of events that are regularly repeated in the same order.
  7. 13. atoms as a source of nuclear energy.
  8. 16. prone to change, fail, or give way; not stable.
  9. 17. is the chemical element with the symbol H and atomic number 1.
  10. 19. the chemical element of atomic number 6.
  11. 20. colorless, odorless reactive gas
  12. 21. individually separate and distinct.
Down
  1. 1. strength and vitality required for sustained physical or mental activity.
  2. 2. stable subatomic particle with a charge of negative electricity
  3. 3. a radioactive isotope of hydrogen with a mass approximately
  4. 4. very close to; almost.
  5. 6. wind:the continuous flow of charged particles from the sun which permeates the solar system.
  6. 8. change which is a result or consequence of an action or other cause.
  7. 9. container, typically made of glass or plastic
  8. 11. a particular place or point.
  9. 12. hydride: DescriptionThe helium hydride ion or hydroxide helium ion or helium is a cation with the chemical formula HeH⁺.
  10. 14. imparting or exchanging of information or news..
  11. 15. stable isotope of hydrogen with a mass approximately twice that of the usual isotope.
  12. 18. The emission of energy as electromagnetic waves or as moving subatomic particles.
  13. 19. A measure of the amount of matter contained in or constituting a physical body.