| Group → | 5 |
|---|---|
| ↓ Period | |
| 4 | 23 V |
| 5 | 41 Nb |
| 6 | 73 Ta |
| 7 | 105 Db |
All of these elements are classed in Group 5 because their valence shell holds five electrons. Dubnium can only be produced in the laboratory, and does not exist in nature.
| >Explanation of periodic table slice on right: | Transition metals | atomic number in black are solids | solid borders are older than the Earth (Primordial elements) | dotted borders are made artificially (Synthetic elements) |