Electron configuration worksheet

Using the electron configuration chart given at:

http://periodictablewithnames.net/electronconfigurationchartandworksheet/ solve the following

exercises.

I. Write a ground state electron configuration for each neutral atom listed below. Ground state

means that all of the lowest possible energy levels (up to the proper number of electrons for

the element) are filled.

1. K

2. Pb

3. Sc

4. Ra

5. O

6. Ag

7. Ru

8. Ce

9. I

10. F

2. Write a ground state electron configuration for these ions. Ions can gain or lose electrons so

remember that a positive ion (cation) has less number of electrons than its neutral form

whereas a negative ion (anion) has more electrons than its neutral form.

Example: C4+

is a cation thus has 4 electrons less than its neutral form C0. If C

0 has 6 electrons

and its configuration is 1s2 2s

2 2p

2, then C

4+ should have only two electrons; thus its electron

configuration would be 1s2.

11. O2-

12. Fe3+

13. Br-1

14. Ni2+

15. K+

16. Cu2+

17. F-1

18. Ca+2

3. Choose 3 possible elements or ions that may represent the following electron configurations

19. 1s2 2s

2 2p

6 3s

2 3p

6 4s

2 3d

1

20. 1s2 2s

2 2p

6 3s

2 3p

6 4s

2 3d

10 4p

6

21. 1s2 2s

2 2p

6 3s

2 3p

6 4s

2 3d

10

22. 1s2 2s

2 2p

6 3s

2 3p

6 4s

2 3d

10 4p

6 5s

2

23. 1s2 2s

2 2p

6 3s

2 3p

6 4s

2 3d

10 4p

6 5s

2 4d

4

24. [Ar] 4s1

25. [Ar] 4s2 3d

5

26. [Ne] 3s2

27. [Ne] 3s23p

4

28. [Kr] 5s2 4d

10 5p

2

Find all the information you need about the periodic table at:

http://periodictablewithnames.net