Electron Configuration Practice
A. For each element: identify the number of electrons, fill in the electron diagram with up-spin and down-spin electrons, and write the electron configuration.
Ex. Oxygen
1s
Number of electrons: ________
2s
1. Aluminum
1s
2s
2. Argon
1s
2s
2s
2s
5. Carbon
1s
4s
Number of electrons: ________
2p
3s
3p
2p
3s
3p
2p
3s
3p
4s
3s
3p
2s
2p
3s
3p
4s
2p
3s
3p
5s
4d
5p
3d
4p
5s
4d
5p
3d
4p
5s
4d
5p
Electron configuration: __________________________________________________________
4s
3d
4p
5s
4d
5p
Electron configuration: __________________________________________________________
4s
3d
4p
5s
4d
5p
Electron configuration: __________________________________________________________
4s
Number of electrons: ________
2s
4p
Electron configuration: __________________________________________________________
Number of electrons: ________
2p
3d
Electron configuration: __________________________________________________________
Number of electrons: ________
6. Silver
1s
3p
Number of electrons: ________
4. Strontium
1s
3s
Number of electrons: ________
3. Iron
1s
2p
Electron configuration: __________________________________________________________
3d
4p
5s
4d
5p
Electron configuration: __________________________________________________________
4s
3d
4p
5s
4d
5p
B. Identify the element given the following electron configuration.
7. 1s22s1
_____________________________________________________________________________
8. 1s22s22p63s23p64s23d9
_____________________________________________________________________________
9. 1s22s22p63s23p64s23d104p5
_____________________________________________________________________________
10. 1s22s22p63s23p64s2
_____________________________________________________________________________
11. 1s22s22p63s23p64s23d104p65s24d2
_____________________________________________________________________________
C. Write the electron configuration for each element.
12. Antimony:
_______________________________________________________________________________________________________________
13. Helium:
_______________________________________________________________________________________________________________
14. Chromium:
_______________________________________________________________________________________________________________
15. Technetium:
_______________________________________________________________________________________________________________
16. Cobalt:
_______________________________________________________________________________________________________________
17. Xenon:
_______________________________________________________________________________________________________________
18. Phosphorus:
_______________________________________________________________________________________________________________
19. Palladium:
_______________________________________________________________________________________________________________
20. Sodium:
_______________________________________________________________________________________________________________
D. Electron Configuration Shorthand
21. A. Write the electron configuration for Neon: __________________________________________________________________________________________
B. Write the electron configuration for Sodium: ________________________________________________________________________________________
C. What is similar between the two configurations? _____________________________________________________________________________________
D. Consider:
[Ne]3s1
What do you think the [Ne] represents? _________________________________________________________________
E. What is similar between all elements in the last column on the periodic table (column number 18)? ____________________________________________
F. How can these elements be used as a shorthand when writing electron configurations? ______________________________________________________
22. Practice writing the following elements using the shorthand:
A. Beryllium: ______________________________________
B. Vanadium: _________________________________________
B. Identify the element given the following electron configuration.
7. 1s22s1
_______________________________________
8. 1s22s22p63s23p64s23d9
_______________________________________
9. 1s22s22p63s23p64s23d104p5
_______________________________________
10. 1s22s22p63s23p64s2
_______________________________________
11. 1s22s22p63s23p64s23d104p65s24d2
_______________________________________
C. Write the electron configuration for each element.
12. Antimony:
________________________________________________________________________
13. Helium:
________________________________________________________________________
14. Chromium:
________________________________________________________________________
15. Technetium:
________________________________________________________________________
16. Cobalt:
________________________________________________________________________
17. Xenon:
________________________________________________________________________
18. Phosphorus:
________________________________________________________________________
19. Palladium:
________________________________________________________________________
20. Sodium:
________________________________________________________________________
D. Electron Configuration Shorthand
21. A. Write the electron configuration for Neon: _______________________________________________________
B. Write the electron configuration for Sodium: _____________________________________________________
C. What is similar between the two configurations? _________________________________________________
D. Consider:
[Ne] 3s1
What do you think the [Ne] represents?
___________________________________________________________________________________________
E. What is similar between all elements in the last column on the periodic table (column number 18)?
___________________________________________________________________________________________
F. How can these elements be used as a shorthand when writing electron configurations?
___________________________________________________________________________________________
22. Practice writing the following elements using the shorthand:
A. Beryllium: _________________________
B. Vanadium: _________________________
C. Germanium: _______________________
D. Tellurium: _________________________