This is also called as 4d series which corresponds the filling of 4d orbital. It starts from yttrium whose atomic number is 39 and includes 10 elements till cadmium whose atomic number is 48.
Second transition series (or) 3d series
| Element |
Atomic Number |
Symbol |
Electronic configuration |
| Ytterium |
39 |
Y |
[Kr] 4d1 5s2 |
| Zirconium |
40 |
Zr |
[Kr] 4d2 5s2 |
| Niobium |
41 |
Nb |
[Kr] 4d4 5s1 |
| Molybdenum |
42 |
Mo |
[Kr] 4d5 5s1 |
| Technetium |
43 |
Tc |
[Kr] 4d5 5s2 |
| Ruthenium |
44 |
Ru |
[Kr] 4d7 5s1 |
| Rhodium |
45 |
Rh |
[Kr] 4d8 5s1 |
| Palladium |
46 |
Pd |
[Kr] 4d10 5s0 |
| Silver |
47 |
Ag |
[Kr] 4d10 5s1 |
| Cadmium |
48 |
Cd |
[Kr] 4d10 5s2 |
