| WebElements__Rhodium Extensive information on history, uses, occurrence, compounds, and properties. |
| Wikipedia__Rhodium Properties of the element, including its history, applications, and characteristics. |
| Radiochemistry_of_Rhodium Full text of the monograph by James Armstrong (Florida State University, Tallahassee, Florida). [PDF] (May, 1965) |
| ChemicalElements_com__Iridium Basic information, atomic structure, and table of isotopes. |
| EnvironmentalChemistry_com__Iridium Atomic structure, chemical and physical properties, and table of nuclides. |
| Iridium Data tables and historic information. |
| It\'s_Elemental__Iridium Basic physical and historical information. |
| LANL__Iridium History, properties, uses, and sources. |
| Lenntech__Iridium Physical data, chemical properties, health and environmental effects. |
| Visual_Elements__Iridium Image, general and physical information, source, uses, key isotopes, and ionisation energies. |
| WebElements__Iridium Extensive information on history, uses, occurrence, compounds, and properties. |
| Wikipedia__Iridium Properties of the element, including its history, applications, and characteristics. |
| Radiochemistry_of_Iridium Full text of the monograph by G. W. Leddicotte (Oak Ridge National Laboratory, Oak Ridge, Tennessee). [PDF] (October, 1961) |
| ChemicalElements_com__Silver Basic information, atomic structure, and isotopes. |
| EnvironmentalChemistry_com__Silver Atomic structure, chemical and physical properties, and table of nuclides. |
| It\'s_Elemental__Silver Basic physical and historical information. |
| LANL__Silver Properties, uses, handling, and cost. |
| Lenntech__Silver Physical data, chemical properties, health and environmental effects. |
| Silver Data tables and historic information. |
| Visual_Elements__Silver Image, general and physical information, source, uses, key isotopes, and ionisation energies. |
| WebElements__Silver Extensive information on history, uses, occurrence, compounds, and properties. |
| Wikipedia__Silver Properties of the element, including its history, applications, and charateristics. |
| Radiochemistry_of_Silver D. N. Sunderman (Battelle Memorial Institute, Columbus, Ohio). [PDF] (November, 1961) |
| Apsidium__Roentgenium Basic information and atomic structure. |
| IUPAC__Roentgenium A note about confirmation of synthesis of the element 111. |
| Wikipedia__Roentgenium Basic physical and historical information. |
| ChemicalElements_com__Osmium Basic information, atomic structure, and isotopes. |
| EnvironmentalChemistry_com__Osmium Atomic structure, chemical and physical properties, and table of nuclides. |
| It\'s_Elemental__Osmium Basic physical and historical information. |
| LANL__Osmium Sources, properties, handling, and uses. |
| Lenntech__Osmium Physical data, chemical properties, health and environmental effects. |
| Osmium Data tables and historic information. |
| Visual_Elements__Osmium General and physical information, source, uses, key isotopes, and ionisation energies. |
| WebElements__Osmium Extensive information on history, uses, occurrence, compounds, and properties. |
| Wikipedia__Osmium Properties of the element, including its history, applications, and characteristics. |
| Radiochemistry_of_Osmium Full text of the monograph by G. W. Leddicotte (Oak Ridge National Laboratory, Oak Ridge, Tennessee). [PDF] (October, 1961) |
| Almanac_of_Policy_Issues__Ozone Includes information about the effects of ozone on human health and the environment. |
| David_J__Williams_-_Ozone_Research Personal website presents research concerning the meteorological transport of tropospheric (ground-level) ozone and its precursors. |
| HowStuffWorks__How_Ozone_Pollution_Works Illustrated tutorial examines what ozone is, how it is produced, what health hazards it poses, and what people can do to reduce ozone pollution. |
| North_American_Research_Strategy_for_Tropospheric_Ozone_Research_Initiative Fact sheet (1997) about joint governmental effort to understand ground-level ozone. |