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# Electron Configuration Practice Worksheet

By Tom Snyder,2014-11-17 00:39
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Electron Configuration Practice WorksheetElectr

Name:____________________Hour:_________

Introduction to Electron Configuration Practice Worksheet #2HW for quiz

Copy the Aufbau Diagonal Rule diagram below:

Remember how many electrons each orbital type can have! This is key! s maximum is 2 e- p maximum is 6 e- d maximum is 10 e- f maximum is 14 e-

In the space below, write the electron configurations of the following elements. 1. Begin with filling the 1s orbital (s max is two electrons) 2. Move down to the next diagonal line and fill 2s

3. Work your way down through the next diagonal group, starting with 2p, etc until all electrons are accounted for.

For example: Carbon’s electron configuration

Carbon has an atomic number of 6 (6 positive protons) so for a neutral atom it must have 6 negative electrons

2 1. Begin with filling the 1s orbital (s max is two electrons) 1s 2 2. Move down to the next diagonal line and fill 2s (s max is two electrons) 2s

2 3. Work your way down through the next diagonal group, starting with 2p, etc until all electrons 2p are accounted for.

2 22 1s2s2pSame as using the Periodic Table but you don’t have to memorize the entire table!

Element Name Number of Electrons Configuration 1) nitrogen ________________________________________________

2) iron ________________________________________________

3) neon ________________________________________________

4) chlorine ________________________________________________

5) tin ________________________________________________

Element Name Number of Electrons Configuration 6) silicon ________________________________________________

7) potassium ________________________________________________

8) tellurium ________________________________________________

9) magnesium ________________________________________________

10) lawrencium ________________________________________________

Write the super simplified electron configurations of these elements using the core noble gases (i.e.

[Ne])

11) potassium__________________________________

12) sodium____________________________________

13) calcium____________________________________

Electron Configurations - Solutions

Note: The electron configurations in this worksheet assume that lanthanum (La) is the first element

in the 4f block and that actinium (Ac) is the first element in the 5f block. If your periodic table doesn’t

agree with this, your answers for elements near the f-orbitals may be slightly different.

22611) sodium 1s2s2p3s

22626262) iron 1s2s2p3s3p4s3d

2262621053) bromine 1s2s2p3s3p4s3d4p

226262106210624) barium 1s2s2p3s3p4s3d4p5s4d5p6s

226262106210621410625 5) neptunium 1s2s2p3s3p4s3d4p5s4d5p6s4f5d6p7s5f

276) cobalt …. 4s3d

297) silver ……5s4d

21048) tellurium ……5s4d5p

214110) lawrencium …….7s5f6d

2262411) 1s2s2p3s3p sulfur

226262106112) 1s2s2p3s3p4s3d4p5s rubidium

22626210513) 1s2s2p3s3p4s4d4p not valid (take a look at “4d”)

2263514) 1s2s2p3s3d not valid (3p comes after 3s)

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