Atoms & Electrons Crossword Puzzle

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Across
  1. 4. the element with an atomic mass of 20.180 amu
  2. 7. substance made up of only one type of atom
  3. 10. makes up all matter
  4. 12. the very first element on the periodic table
  5. 13. what the "s" is in 1s2(electron conficuration)
  6. 15. the most dense part of an atom
  7. 16. a version of an element(has a different amount of neutrons)
  8. 21. where the electrons are found within an atom
  9. 22. what the elements on the periodic table have in common when they are in the same column
  10. 23. positively charged ion/particle
Down
  1. 1. what the elements on the periodic table have in common when they are in the same row
  2. 2. negatively charged ion/particle
  3. 3. negatively charged subatomic particles
  4. 5. particles with no charge
  5. 6. what the "1" is in 1s2(electron configuration)
  6. 8. the elements with 19 protons
  7. 9. positively charged subatomic particles
  8. 10. a principle that states that electrons always assume the lowest energy orbital available
  9. 11. an element that contains a full outer ring
  10. 12. the noble gas with 2 valence electrons
  11. 14. the element that is identified as "Cu"
  12. 17. the element that is identified as "Sn"
  13. 18. the noble gas with the most amount of orbitals
  14. 19. a table that contains all the known elements
  15. 20. also known as "the seat bus rule"