Atomic Structure

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Across
  1. 3. Basic unit of all matter
  2. 6. Number of protons and neutrons in nucleus of an atom
  3. 7. Columns on periodic table equal to valance electrons
  4. 8. Subatomic particle with a negative charge
  5. 9. Subatomic particle with a neutral charge
  6. 10. Pure substance made of only one kinds of atom
Down
  1. 1. Number of protons in the nucleus of an atom
  2. 2. Electrons in outermost energy level
  3. 4. Subatomic particle with a positive charge
  4. 5. Rows on periodic table equal to energy levels