Atomic Theory and Elements Crossword

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Across
  1. 2. Chemical symbol is Na on the periodic table.
  2. 5. Chemical symbol is Br on the periodic table.
  3. 10. A negatively charged particle that moves around the nucleus.
  4. 12. A scientific representation used to explain how atoms work.
  5. 13. Chemical symbol is Mg on the periodic table.
  6. 15. Chemical symbol is Cl on the periodic table.
  7. 16. A substance made of only one type of atom.
  8. 19. Chemical symbol is H on the periodic table.
  9. 21. Chemical symbol is Ca on the periodic table.
  10. 22. Scientist who discovered the nucleus through the gold foil experiment.
  11. 26. Chemical symbol is Ag on the periodic table.
  12. 27. A positively charged particle found in the nucleus of an atom.
  13. 28. Scientist who discovered the electron and proposed the plum pudding model.
  14. 29. Chemical symbol is Fe on the periodic table.
Down
  1. 1. A substance formed when two or more elements are chemically bonded.
  2. 3. Chemical symbol is U on the periodic table.
  3. 4. Shell Energy levels where electrons are found around the nucleus.
  4. 6. Chemical symbol is He on the periodic table.
  5. 7. Chemical symbol is Au on the periodic table.
  6. 8. Chemical symbol is O on the periodic table.
  7. 9. Theory The idea that all matter is made of tiny particles called atoms.
  8. 11. Electrons Electrons in the outer shell of an atom that affect bonding.
  9. 14. The smallest unit of an element that still keeps its properties.
  10. 17. The dense center of an atom containing protons and neutrons.
  11. 18. Scientist who proposed electrons move in fixed energy levels.
  12. 20. A neutral particle found in the nucleus of an atom.
  13. 23. Scientist who developed the early atomic theory.
  14. 24. Chemical symbol is C on the periodic table.
  15. 25. Chemical symbol is Cu on the periodic table.