Unit 3 Crossword Puzzle

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Across
  1. 3. Tells the shape of the electron cloud.
  2. 5. The order of elements based on their atomic number.
  3. 10. The number of protons in an atom, defining its identity.
  4. 12. The outermost shell of an atom where electrons are located.
  5. 13. Forces that determine the behavior of elements.
  6. 14. Atoms with 26 protons.
  7. 15. Name of the elements in group 2 of the periodic table.
  8. 16. Distance between the two crests
  9. 17. Energy required to remove an electron from an atom.
  10. 18. The force that holds atoms together in a compound
  11. 19. Bond formed by the transfer of electrons between atoms.
Down
  1. 1. The number of valence electrons determines an element's ___.
  2. 2. The number of electrons in the outermost shell of an atom.
  3. 4. The unique arrangement of atoms in a molecule.
  4. 6. Who discovered atoms in the year 400 B.C?
  5. 7. Basic building blocks of matter, composed of protons, neutrons, and electrons.
  6. 8. Number of waves passing through a single point in one second.
  7. 9. Colors of light that we can see with our eyes.
  8. 11. Sharing of electrons between atoms forms this type of bond.
  9. 20. A bond formed by the attraction between positively and negatively charged ions.