4D –SERIES D-BLOCK ELEMENTS
39. Yttrium
40.Zirconium
41. Niobium
42.Molybdenum
43. Technetium
44. Ruthenium
45. Rhodium
46. Palladium
47. Silver
48. CadmiumSecond (4d) Transition Series (Y-Cd)
| At. No. | 39 | 40 | 41 | 42 | 43 | 44 | 45 | 46 | 47 | 48 |
| Element | Y | Zr | Nb | Mo | Tc | Ru | Rh | Pd | Ag | Cd |
| Config. | 4d15s2 | 4d25s2 | 4d45s1 | 4d55s1 | 4d55s2 | 4d75s1 | 4d85s1 | 4d105s0 | 4d105s1 | 4d105s2 |
Wrong . Tc configuration is 4d^6 5s^1
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