Elements and Atoms

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Across
  1. 3. the unit used to measure atomic mass
  2. 4. positive charge, located in nucleus
  3. 6. 1s2-2s2-2p6-3s2-3p4
  4. 7. the horizontal rows on the periodic table
  5. 10. the percent of an isotope present on earth
  6. 11. the vertical columns on the periodic table
  7. 12. neutral charge, located in nucleus
  8. 13. part of the alkali metals, located in period two
  9. 15. atomic number 36
Down
  1. 1. average mass of all isotopes of an element
  2. 2. represented by amount of protons
  3. 3. number of protons plus neutrons of an atom
  4. 5. the first element on the periodic table
  5. 8. negative charge, located in the shell
  6. 9. [Xe]
  7. 14. [Ar]4s2-3d6