#1

123456789101112131415161718
Across
  1. 3. __________ number that represents the amount of protons in an atom
  2. 4. the sharing of valence electrons
  3. 5. when an electron “jumps” and falls back towards the nucleus it gives off _______
  4. 6. the size of an atom ______________ as you go from left to right
  5. 8. the scientist who created the periodic table (he has element 101 named after him!)
  6. 14. a negative subatomic particle
  7. 15. a neutral subatomic particle
  8. 16. 78% of the elements on the periodic table
  9. 17. the simplest form of matter that represents an element
  10. 18. the ability for an element to attract an electron
Down
  1. 1. the first ring holds ______ electrons
  2. 2. electrons on the outermost ring
  3. 5. another word for shiny
  4. 7. there are 118 total
  5. 9. the center of the atom that holds protons and neutrons
  6. 10. a positive subatomic particle
  7. 11. elements that can act both like a metal or nonmetal
  8. 12. when two or more atoms bond
  9. 13. the scientist who uses rings (energy levels) to model his atom