| USGS_Minerals_Information__Niobium Statistics and information on the worldwide supply, demand, and flow of the element (PDF format). |
| Visual_Elements__Niobium Image, uses, general information, and ionisation energies. |
| WebElements__Niobium Extensive information on history, uses, occurrence, compounds, and properties of the element. |
| Wikipedia__Niobium Properties of the element, including its history, applications, and characteristics. |
| ChemicalElements_com__Yttrium Basic information, atomic structure, and isotopes. |
| The_Columbia_Encyclopedia__Yttrium Overview for the general reader. |
| EnvironmentalChemistry_com__Yttrium Atomic structure, chemical and physical properties, and table of nuclides. |
| It\'s_Elemental__Yttrium Basic physical and historical information. |
| LANL__Yttrium History, sources, properties, uses, and isotopes. |
| Lenntech__Yttrium Physical data, chemical properties, health and environmental effects. |
| Visual_Elements__Yttrium Image, animation, uses, physical information, and ionisation energies. |
| WebElements__Yttrium Extensive information on history, uses, occurrence, compounds, and properties of the element. |
| Wikipedia__Yttrium Properties of the element, including its history, applications, and characteristics. |
| Yttrium Data tables and historic information. |
| Britannica_Nobel_Prize__Technetium Overview and basic data. |
| ChemicalElements_com__Technetium Basic information, atomic structure, and isotopes. |
| EnvironmentalChemistry_com__Technetium Atomic structure, chemical and physical properties, and table of nuclides. |
| It\'s_Elemental__Technetium Basic physical and historical information. |
| LANL__Technetium History, isotopes, properties, and handling. |
| Lenntech__Technetium Physical data, chemical properties, and health effects. |
| Technetium Data tables and historic information. |
| Visual_Elements__Technetium Image, general and physical information, source, uses, key isotopes, and ionisation energies. |
| WebElements__Technetium Extensive information on history, uses, occurrence, compounds, and properties. |
| Wikipedia__Technetium Properties of the element, including its history, applications, and characteristics. |
| Radiochemistry_of_Technetium Full text of the monograph by Edward Anders (Enrico Fermi Institute and Dept. of Chemistry, University of Chicago, Chicago, Illinois). [PDF format] (November, 1960) |
| ChemicalElements_com__Rhenium Basic information, atomic structure, and isotopes. |
| EnvironmentalChemistry_com__Rhenium Atomic structure, chemical and physical properties, and table of nuclides. |
| It\'s_Elemental__Rhenium Basic physical and historical information. |
| LANL__Rhenium History, sources, properties, and uses. |
| Lenntech__Rhenium Physical data, chemical properties, and health effects. |
| Rhenium Data tables and historic information. |
| USGS_Minerals_Information__Rhenium Statistics and information on the worldwide supply, demand, and flow of the element (PDF format). |
| Visual_Elements__Rhenium General and physical information, source, uses, key isotopes, and ionisation energies. |
| WebElements__Rhenium Extensive information on history, uses, occurrence, compounds, and properties. |
| Wikipedia__Rhenium Properties of the element, including its history, applications, and characteristics. |
| Radiochemistry_of_Rhenium Full text of the monograph by G. W. Leddicotte (Oak Ridge National Laboratory, Oak Ridge, Tennessee). [PDF] (March, 1961) |
| ChemicalElements_com__Mercury Basic information, atomic structure, and isotopes. |
| EnvironmentalChemistry_com__Mercury___Nuclides Extensive information on the nuclides of mercury, including potential parent nuclides. |
| It\'s_Elemental__Mercury Basic physical and historical information. |
| LANL__Mercury Basic information, history, and uses. |
