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| | Henry Moseley - Wikipedia, the free encyclopedia |
 | | Henry Gwyn Jeffreys Moseley (November 23, 1887-August 10, 1915) was an English physicist. |
 | | In addition, Moseley showed that there were gaps in the sequence at numbers 43, 61 and 75 (now known to be radioactive, non-naturally-occurring, technetium and promethium, and the last discovered naturally-occurring element rhenium, respectively). |
 | | Mendeleev had previously predicted technetium, and Bohuslav Brauner had previously predicted promethium; Moseley confirmed their predictions, predicted one additional undiscovered element, and showed there were no other gaps in the periodic table between aluminum and gold. |
| www.wikipedia.org /wiki/Henry_Moseley (317 words) |
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