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technetium (Tc)
A radioactive metallic element in group VIIB of the periodic table; a translation element. Technetium does not occur naturally on Earth but was discovered in 1937 by Emilio Segré and Carlo Perrier in bombarded molybdenum – the first element to be made artificially. It is now recovered from the fission products of nuclear reactors. Technetium is chemically very like rhenium.
| atomic number | 43 |
| relative atomic mass | 99 |
| relative density | 11.5 |
| melting point | 2,140°C (3,884°F) |
| boiling point | 5,030°C (9,086°F) |
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