5D –SERIES D-BLOCK ELEMENTS
*57.Lanthanum
72. Hafnium
73. Tantalum
74. Tungsten
75. Rhenium
76. Osmium
77. Iridium
78. Platinum
79. Gold
80. Mercury
Third (5d) Transition Series (Lu-Hg)
| At.No | 71 | 72 | 73 | 74 | 75 | 76 | 77 | 78 | 79 | 80 |
| Element | Lu | Hf | Ta | W | Re | Os | Ir | Pt | Au | Hg |
| Config. | 5d16s2 | 5d26s2 | 5d36s2 | 5d46s2 | 5d56s2 | 5d66s2 | 5d76s2 | 5d96s1 | 5d106s1 | 5d106s2
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