1
Rubidium Rb
37
2
Strontium Sr
38
3
Yttrium Y
39
4
Zirconium Zr
40
5
Niobium Nb
41
6
Molybdenum Mo
42
7
Technetium Tc
43
8
Ruthenium Ru
44
9
Rhodium Rh
45
10
Palladium Pd
46
11
Silver Ag
47
12
Cadmium Cd
48
13
Indium In
49
14
Tin Sn
50
15
Antinomy Sb
51
16
Tellurium Te
52
17
Iodine I
53
18
Xenon Xe
54
19
Cesium Cs
55
20
Barium Ba
56
21
Lanthanum La
57