Atomic Structure

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Across
  1. 2. Tells the number of protons and neutrons in the nucleus of an atom
  2. 3. atoms of the same element with different numbers of neutrons
  3. 6. neutral particle in the nucleus with protons
  4. 8. Weighted average of all of the different versions of an element
  5. 11. positive particle in the nucleus
Down
  1. 1. Electrons in the outermost energy level
  2. 4. negative particle outside of the nucleus in the electron cloud
  3. 5. The horizontal rows on the periodic table that indicate the number of energy levels an atom has
  4. 7. The vertical columns on the periodic table that indicate the number of valence electrons in an atom
  5. 9. Tells the number of protons in an atom of the element
  6. 10. the smallest particle of an element that still has the properties of that element.