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Homework: Electron Configuration


  1. Fill the boxes below with the arrow notation for electrons showing the correct ground state electron configuration for Al. To the right of the boxes, draw the Lewis Dot Diagram for neutral Al.
electron.boxes.to.fill (3K)
  1. Write out the electron configuration in the short-hand notation.
  2. Fill the boxes below with the arrow notation for electrons showing the correct ground state electron configuration for P. To the right of the boxes, draw the Lewis Dot Diagram for neutral P.
electron.boxes.to.fill (3K)
  1. Write out the electron configuration in the short-hand notation.
  2. Fill the boxes below with the arrow notation for electrons showing the correct ground state electron configuration for Br. To the right of the boxes, draw the Lewis Dot Diagram for neutral Br.
electron.boxes.to.fill (3K)
  1. Write out the electron configuration in the short-hand notation.


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  1. Write out the shorthand notation for the electron configuration of Li.
  2. Write out the shorthand notation for the electron configuration of Ga.
  3. Write out the shorthand notation for the electron configuration of Mg.
  4. Write out the shorthand notation for the electron configuration of K.
  5. How do you write the electron configuration for an ion?
  6. How do you draw the Lewis Dot Diagram for an ion?
  7. Write the short-hand electron configuration and draw the Lewis Dot Diagram for the following ions:
  1. Mg2+
  2. F-
  1. Cl-
  2. K+
  1. What do the Lewis Dot Diagrams you drew in the previous problem have in common? Why?
  2. Which shell of an atom is the most important shell when you want to know something about how an element will react chemically? Why?
  3. Up to now you have been told to predict the electric charge an element is most likely to have based on its position in the periodic table. Actually, things are a bit more complicated than that. The element carbon (C) for example is not usually observed in nature with a charge of either +4 or –4. Instead, carbon tends to form four bonds with other atoms. Chemists say that carbon has a valence of four. Similarly, nitrogen (N) has a valence of 3 most of the time. Describe in your own words how to figure out the valence of an element. Use what you have learned about electron configuration.
  4. What orbitals are allowed in principal quantum numbers 1, 2, 3, and 4?
  5. How does the Aufbau Principle work? What is Hund’s Rule? What is the Pauli Exclusion Principle?
This homework assignment belongs with the Electron Configuration Activity.
Last updated: Mar 25, 2007       Home