3: Trends in atomic radii of
transition elements
Atomic number
21
22
23
24
25
26
27
28
29
30
Electronic configuration
M
3d
14s
2
3d
24s
2
3d
34s
2
3d
54s
1 3d
54s
2
3d
64s
2
3d
74s
2
3d
84s
2
3d
104s
1
3d
104s
2
M
+
3d
14s
1
3d
24s
1
3d
34s
1
3d
5
3d
54s
1
3d
64s
1
3d
74s
1
3d
84s
1
3d
10
3d
104s
1
M
2+
3d
1
3d
2
3d
3
3d
4
3d
5
3d
6
3d
7
3d
8
3d
9
3d
10
M
3+
[Ar]
3d
1
3d
2
3d
3
3d
4
3d
5
3d
6
3d
7
–
–
Enthalpy of atomisation, DaH o/kJ mol
–1
326
473
515
397
281
416
425
430
339
126
Ionisation enthalpy/DDDDDiH o/kJ mol
–1
DiHo
I
631
656
650
653
717
762
758
736
745
906
DiHo
II
1235
1309
1414
1592
1509
1561
1644
1752
1958
1734
DiHo
III
2393
2657
2833
2990
3260
2962
3243
3402
3556
3837
Metallic/ionic
M
164
147
135
129
137
126
125
125
128
137
radii/pm
M
2+
–
–
79
82
82
77
74
70
73
75
M
3+
73
67
64
62
65
65
61
60
–
–
Standard
electrode
M
2+/M
–
–1 63
–1 18
–0 90
–1