atomic structure

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Across
  1. 4. Electrons are located in different energy shells around the nucleus.
  2. 6. The particles in the nucleus with no charge.
  3. 8. The simplest atom with one proton and one electron.
  4. 10. Number This number tells you the number of protons in an atom.
  5. 12. The negatively charged particle in an atom.
  6. 13. The particle in an atom that has a positive charge.
Down
  1. 1. The center of an atom.
  2. 2. Number The number of protons and neutrons in an atom.
  3. 3. Horizontal rows on the periodic table are called periods.
  4. 5. A table chart organizing elements by increasing atomic number.
  5. 7. Elements in the same column on the periodic table are in the same group.
  6. 9. The particles that make up everything.
  7. 10. The smallest unit of an element.
  8. 11. The total charge of an atom.