Chemistry
| Z | Element | No. of electrons/shell |
|---|---|---|
| 25 | manganese | 2, 8, 13, 2 |
| 43 | technetium | 2, 8, 18, 13, 2 |
| 75 | rhenium | 2, 8, 18, 32, 13, 2 |
| 107 | bohrium | 2, 8, 18, 32, 32, 13, 2 |
Bohrium has not been isolated in pure form, and its properties have not been conclusively observed; only manganese, technetium, and rhenium have had their properties experimentally confirmed. All three elements are typical silvery-white transition metals, hard, and have high melting and boiling points.
Read more about this topic: Group 7 Element
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