Atoms and the Periodic Table

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Across
  1. 3. The smaller particles that make up protons and neutrons.
  2. 4. Positively charged particles.
  3. 7. Negatively charged particles.
  4. 9. The horizontal rows on the periodic table.
  5. 10. Elements that share number of protons, but have a different number of neutrons.
  6. 11. When we add the number of protons and neutrons, we get the ______ number.
  7. 13. Our current atomic model is called the electron _________ model.
Down
  1. 1. Energy ___________ the further away from the nucleus electrons get. (Increases or decreases)
  2. 2. The center of the atom that holds protons and neutrons.
  3. 5. Particles that do not have a charge.
  4. 6. The vertical columns on the periodic table.
  5. 8. The number of electrons that fit on the first ring around the nucleus.
  6. 12. The number of protons is shown on the periodic table with the _________ number.