Atomic Radius And Atomic Number Worksheet
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5Atomic Radius vs. Atomic Number
The radius of atoms is measurable and predictable. The size of atoms depends on the number of occupied
energy levels and the strength of attraction that the nucleus has for its electrons. Since electrons all have a
negative charge, they should repel each other, but since protons have a positive charge, there is an attraction of
the electrons toward the nucleus where protons are found. Using this information, what do you predict will
happen to the size of atoms as you
a) go across a period? __________________________________________________________________________
b) go down a family? _______________________________________________
Using the data in the chart, make a line graph of the radius vs. the atomic number. Then follow the directions in
-9
marking the graph. (The radius unit is nanometers, 10
meter)
At. #
radius
At. #
radius
At. #
radius
At. #
radius
At. #
radius
At. #
radius
1
0.030
2
0.093
3
0.152
4
0.111
5
0.088
6
0.077
7
0.070
8
0.066
9
0.064
10
0.112
11
0.186
12
0.160
13
0.143
14
0.117
15
0.110
16
0.104
17
0.099
18
0.154
19
0.231
20
0.197
21
0.160
22
0.146
23
0.131
24
0.125
25
0.129
26
0.126
27
0.125
28
0.124
29
0.128
30
0.133
31
0.122
32
0.122
33
0.121
34
0.117
35
0.114
36
0.169
37
0.244
38
0.215
39
0.180
40
0.157
41
0.143
42
0.136
43
0.137
44
0.133
45
0.134
46
0.138
47
0.144
48
0.149
49
0.162
50
0.140
51
0.141
52
0.137
53
0.133
54
0.190
lonization Energy vs. Atomic Number
Ions form by the loss or gain of electrons. lonization energy is the energy needed to remove the most loosely
held valence electron from the atom (to make the atom a +1 ion). The following table has the ionization
energies of the first 54 elements. Graph the data and then compare it to the atomic radius.
At. #
i.e.
At. #
i.e.
At. #
i.e.
At. #
i.e.
At. #
i.e.
At. #
i.e.
1
13.5
2
24.5
3
5.4
4
9.3
5
8.3
6
11.2
7
14.5
8
13.6
9
17.3
10
21.5
11
5.1
12
7.6
13
6.0
14
8.1
15
11.0
16
10.4
17
13.0
18
15.8
19
4.4
20
6.1
21
6.6
22
6.8
23
6.7
24
6.8
25
7.4
26
7.. 9
27
7..9
28
7.6
29
7.7
30
9.4
31
6.0
32
8.1
33
10.5
34
9.7
35
11.8
36
14.0
37
4.2
38
5.7
39
6.6
40
7.0
41
6.8
42
7..2
43
7.3
44
7.5
45
7.7
46
8.3
47
7.6
48
9.0
49
5.8
50
7.3
51
8.6
52
9.0
53
10.4
54
12.1
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