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Manganese family
Introduction
| Group | 7 |
|---|---|
| Period | |
| 4 | 25 Mn |
| 5 | 43 Tc |
| 6 | 75 Re |
| 7 | 107 Bh |
A Group 7 element is one in the series of elements in group 7 (IUPAC style) in the periodic table, which consists of the transition metals manganese (Mn), technetium (Tc), rhenium (Re), and bohrium (Bh).
All of these elements are classed in Group 7 because their valence shells hold seven electrons. Technetium has no stable isotopes. Technetium and promethium are the only two such elements before polonium, after which no known element has a stable isotope.
| Explanation of right side periodic table slice: | Transition metals | atomic number in black are solids | solid borders are older than the Earth (Primordial elements) | dotted borders are made artificially (Synthetic elements) | dashed borders have no isotopes older than the earth |
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