Atoms Crossword Puzzle

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Across
  1. 3. atomic theory / states that matter is composed of extremely small particles called atoms
  2. 4. / is a subatomic particle that has a mass nearly equal to that of a proton
  3. 8. / is a subatomic particle carrying a charge equal to but opposite that of an electron
  4. 10. Ray / is a high-energy radiation that possesses no mass and is denoted by the symbol Y
  5. 12. / atoms with the same number of protons but different number of neutron
  6. 13. decay / unstable nuclei lose energy by emitting radiation in a spontaneous process
  7. 15. negatively / charged particles that are part of all forms of matter
  8. 16. mass / the weighted average mass of the isotopes of that element
Down
  1. 1. reaction / a reaction that involves a change in an atom's nucleus
  2. 2. / smallest particle of an element that returns the properties of the element
  3. 5. / tiny dense region in the center of the atoms
  4. 6. Particle / is an electron with a 1-charge
  5. 7. ray / a ray, originating from the cathode and traveling to the anode
  6. 9. / the rays and particles emitted by the radioactive material
  7. 11. / the process in which same substances spontaneously emit radiation
  8. 14. radiation / the radiation that was deflected toward the negatively charged plate
  9. 17. number / is the sum of the atomic number(or number of protons) and neutrons in the nucleus