Atoms and the Periodic Table

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Across
  1. 5. Number of protons plus neutrons in an atom.
  2. 6. Number of protons (or electrons) in an atom.
  3. 8. A sub-atomic particle with a positive charge.
  4. 12. Another name for electron shell, where electrons are located around the nucleus.
  5. 14. Maximum number of electrons held in the second energy level.
  6. 15. The rows of the periodic table, which tell us how many energy levels those atoms contain.
  7. 20. I have more protons than any other element on the periodic table.
  8. 22. Group 18 on the periodic table.
  9. 25. The center of the atom, which contains the protons and neutrons.
  10. 26. Family of metals located in Group 1 of the periodic table.
  11. 27. I have 2 electrons in my first energy level, 8 in my second, and 6 in my third.
  12. 28. The COLUMNS of the periodic table, which also tell us the number of valence electrons in those atoms.
  13. 29. Atoms of the same element that have a different number of neutrons.
Down
  1. 1. I am an element with 3 valence electrons and 3 energy levels.
  2. 2. I am a gas with 8 protons and 8 neutrons.
  3. 3. The electrons in the outermost energy level of an atom.
  4. 4. The only element whose atoms do NOT have any neutrons.
  5. 7. Considered the Father of the Periodic Table.
  6. 9. Family of metals located in Group 2 of the periodic table.
  7. 10. Good conductors of electricity, malleable and ductile, and usually solids.
  8. 11. Region surrounding the nucleus which contains electrons,
  9. 13. I can be found in period 5, and I have a full outer shell of electrons.
  10. 16. I can be found in group 9, period 4.
  11. 17. Chemical symbol for sodium.
  12. 18. I am a metal that is a liquid at room temperature.
  13. 19. Number of valence electrons the halogens contain.
  14. 21. A sub-atomic particle with no charge.
  15. 23. An abbreviation for a chemical element.
  16. 24. A sub-atomic particle with a negative charge.