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)

1st Quarter Chemistry 2012: Counting Particles


Protons, Neutrons, and Electrons Practice Worksheet

Fill in the blanks in the following worksheet.  Please keep in mind that the isotope represented by each space may NOT be the most common isotope or the one closest in atomic mass to the value on the periodic table.

Atomic
symbol
Atomic
number

Protons


Neutrons


Electrons

Atomic
mass
B


6



11



24


31
37






39
89

29

35




43


100
Pb




207



102
70



89


225
Mo


53



81



206

100

159


No




261
Yb




172


106
159










Solutions for the Protons, Neutrons, and Electrons Practice Worksheet:


Atomic
symbol
Atomic
number

Protons


Neutrons


Electrons

Atomic
mass
B
5
5
6
5
11
Na
11
11
13
11
24
Ga
31
31
37
31
68
Y
39
39
50
39
89
Cu
29
29
35
29
64
Tc
43
43
57
43
100
Pb
82
82
125
82
207
Yb
70
70
102
70
172
Ac
89
89
136
89
225
Mo
42
42
53
42
95
Tl
81
81
125
81
206
Fm
100
100
159
100
259
No
102
102
159
102
261
Yb
70
70
101
70
172
Sg
106
106
159
106
265