Wednesday, August 8, 2012

1st Quarter Chemistry 2012: Electron Configuration


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  ____________________

12)         1s22s22p63s23p64s23d104p65s1  ____________________

13)         [Kr] 5s24d105p3  ____________________

14)         [Xe] 6s24f145d6  ____________________

15)         [Rn]  7s25f11  ____________________

Determine which of the following electron configurations are not valid:

16)         1s22s22p63s23p64s24d104p5 ____________________

17)         1s22s22p63s33d5  ____________________

18)         [Ra] 7s25f8  ____________________

19)         [Kr]  5s24d105p5 ____________________

20)         [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

12)1s22s22p63s23p64s23d104p65s1  rubidium

13)[Kr] 5s24d105p3  antimony

14)[Xe] 6s24f145d6  osmium

15)[Rn]  7s25f11  einsteinium

16)1s22s22p63s23p64s24d104p5 not valid (take a look at “4d”)

17)1s22s22p63s33d5  not valid (3p comes after 3s)

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

19)[Kr]  5s24d105p5 valid

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

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