Atomic Structure!

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Across
  1. 4. a neutral particle in the nucleus of an atom
  2. 5. a substance made of two or more elements that are chemically combined
  3. 6. the electrons in the outermost shell of an atom; they determine how an atom bond
  4. 9. a pure substance made of only one kind of atom
  5. 11. the number of protons in an atom; identifies the element
  6. 12. a vertical column on the periodic table; elements in the same group share similar properties
  7. 14. a horizontal row on the periodic table; elements in the same period have the same number of energy levels
  8. 15. a positively charged particle in the nucleus of an atom
Down
  1. 1. the total number of protons and neutrons in the nucleus
  2. 2. a chart that organizes all known elements by their properties and atomic number
  3. 3. two or more atoms bonded together
  4. 7. the force that holds atoms together in a molecule or compound
  5. 8. the dense center of the atom that contains protons and neutrons
  6. 10. a negatively charged particle that orbits the nucleus of an atom
  7. 13. the smallest particle of an element