Periodic Trends - Atomic Radius And Ionic Radius Worksheet With Answers Page 3
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suggested answers
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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?
atomic radius decreases
• move down a group?
atomic radius increases
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
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
0.062
11
0.186
12
0.160
13
0.143
14
0.117
15
0.110
16
0.104
17
0.099
18
0.095
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
0.112
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
0.130
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
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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