Periodic Trends - Atomic Radius And Ionic Radius Worksheet With Answers
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date: _______
periodic trends - atomic radius and ionic radius
atomic radius versus atomic number
The radius of atoms is both measurable and predictable. It depends on both the number of occupied energy levels
and the strength of attraction that the nucleus has for its electrons. Since electrons have a negative charge, they repel each
other, but since protons have a positive charge, there is an attraction of the electrons toward the nucleus.
Using this information, predict what will happen to the size (radius) of atoms as you:
• move across a period from left to right?
_____________________________
• move down a group?
_____________________________
Using the data in the chart, make a line graph of the atomic radius vs. the atomic number. Then follow the directions below
for annotating the graph. The unit for atomic radius is nanometers, or 1 x 10
-9
meters.
A. N.
radius
A. N.
radius
A. N.
radius
A. N.
radius
A. N.
radius
A. N.
radius
1
0.030
10
0.093
19
0.152
28
0.111
37
0.088
46
0.077
2
0.070
11
0.066
20
0.064
29
0.112
38
0.186
47
0.160
3
0.143
12
0.117
21
0.110
30
0.104
39
0.099
48
154
4
0.231
13
0.197
22
0.160
31
0.146
40
0.131
49
0.125
5
0.129
14
0.126
23
0.125
32
0.124
41
0.128
50
0.133
6
0.122
15
0.122
24
0.121
33
0.117
42
0.114
51
0.169
7
0.244
16
0.215
25
0.180
34
0.157
43
0.143
52
0.136
8
0.137
17
0.133
26
0.134
35
0.138
44
0.144
53
0.149
9
0.162
18
0.140
27
0.141
36
0.137
45
0.133
54
0.190
ionization energy versus atomic number
Ions are formed form by the loss or gain of electrons. Ionization energy is the energy required 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. Using the data in the chart, make a line graph of the ionization energy vs. the atomic number. Ionization
energy is measured in kilojoules, or kJ.
A. N.
IE
A. N.
IE
A. N.
IE
A. N.
IE
A. N.
IE
A. N.
IE
1
13.5
10
24.5
19
5.4
28
9.3
37
8.3
46
11.2
2
14.5
11
13.6
20
17.3
29
21.5
38
5.1
47
7.6
3
6.0
12
8.1
21
11.0
30
10.4
39
13.0
48
15.8
4
4.4
13
6.1
22
6.6
31
6.8
40
6.7
49
6.8
5
7.4
14
7.9
23
7.9
32
7.6
41
7.7
50
9.4
6
6.0
15
8.1
24
10.5
33
9.7
42
11.8
51
14.0
7
4.2
16
5.7
25
6.6
34
7.0
43
6.8
52
7.2
8
7.3
17
7.5
26
7.7
35
8.3
44
7.6
53
9.0
9
5.8
18
7.3
27
8.6
36
9.0
45
10.4
54
12.1
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