Claude François Geoffroy
Claude François Geoffroy ( 1729 - June 18, 1753 ) was a French chemist. He is considered to be the co-discoverer of bismuth (1753).
He was the son of Claude-Joseph Geoffroy and examined bismuth, which until then had only been used as an additive for tin utensils, following Johann Heinrich Pott . At that time there was the problem of clearly separating bismuth from lead. Like Pott, he found that there were many similarities between the two elements. For example, Geoffroy found that contrary to what Pott said, bismuth gained weight on calcination , similar to lead. He found that, like lead , it can be used in the cupellation of silver and gold. Geoffroy also found distinguishing properties, such as the fact that bismuth burns with a blue flame, while Pott had still assumed that it was not flammable. In a second treatise he wanted to investigate the behavior of lead and bismuth by reacting them with various salts and acids, but died before that.
He was a member of the Académie des Sciences .
Fonts
- Analysis chimique du Bismuth, de laquelle il resulté une analogie entre le plomb et ce sémmétal, Mem. Acad. Royale des Sciences, 1753, pp. 296-312
Individual evidence
- ↑ And not for medical purposes and therefore not in the central interest of the chemists of the time.
- ^ Weeks, Discovery of the elements, 6th edition 1956, pp. 108f.
- ^ List of members since 1666: Letter G. Académie des sciences, accessed on November 18, 2019 (French).
| personal data | |
|---|---|
| SURNAME | Geoffroy, Claude François |
| BRIEF DESCRIPTION | French chemist |
| DATE OF BIRTH | 1729 |
| DATE OF DEATH | June 18, 1753 |