Electron Configuration Practice Worksheet

Electron Configuration Practice Worksheet
In the space below, write the unabbreviated electron configurations of the following elements:

1. 
   sodium ________________________________________________
   

2) iron ________________________________________________

3) bromine ________________________________________________
4) barium ________________________________________________
5) neptunium ________________________________________________
In the space below, write the abbreviated electron configurations of the following elements:
6) cobalt ________________________________________________
7) silver ________________________________________________
8) tellurium ________________________________________________
9) radium ________________________________________________
10) lawrencium ________________________________________________
Determine what elements are denoted by the following electron configurations:

11. 
    1s²2s²2p⁶3s²3p⁴ ____________________
    

11. 
    1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p⁶5s¹ ____________________
    

11. 
    [Kr] 5s²4d¹⁰5p³ ____________________
    

11. 
    [Xe] 6s²4f¹⁴5d⁶ ____________________
    

11. 
    [Rn] 7s²5f¹¹ ____________________
    

Determine which of the following electron configurations are not valid:

11. 
    1s²2s²2p⁶3s²3p⁶4s²4d¹⁰4p⁵ ____________________
    

11. 
    1s²2s²2p⁶3s³3d⁵ ____________________
    

11. 
    [Ra] 7s²5f⁸ ____________________
    

11. 
    [Kr] 5s²4d¹⁰5p⁵ ____________________
    

11. 
    [Xe] ____________________
    

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.
1) sodium 1s²2s²2p⁶3s¹
2) iron 1s²2s²2p⁶3s²3p⁶4s²3d⁶
3) bromine 1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p⁵
4) barium 1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p⁶5s²4d¹⁰5p⁶6s²
5) neptunium 1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p⁶5s²4d¹⁰5p⁶6s²4f¹⁴5d¹⁰6p⁶7s²5f⁵
6) cobalt [Ar] 4s²3d⁷
7) silver [Kr] 5s²4d⁹
8) tellurium [Kr] 5s²4d¹⁰5p⁴
9) radium [Rn] 7s²
10) lawrencium [Rn] 7s²5f¹⁴6d¹

11. 
    1s²2s²2p⁶3s²3p⁴ sulfur
    

11. 
    1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p⁶5s¹ rubidium
    

11. 
    [Kr] 5s²4d¹⁰5p³ antimony
    

11. 
    [Xe] 6s²4f¹⁴5d⁶ osmium
    

11. 
    [Rn] 7s²5f¹¹ einsteinium
    

11. 
    1s²2s²2p⁶3s²3p⁶4s²4d¹⁰4p⁵ not valid (take a look at “4d”)
    

11. 
    1s²2s²2p⁶3s³3d⁵ not valid (3p comes after 3s)
    

11. 
    [Ra] 7s²5f⁸ not valid (radium isn’t a noble gas)
    

11. 
    [Kr] 5s²4d¹⁰5p⁵ valid
    

20) [Xe] not valid (an element can’t be its own electron configuration)

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