| USGS_Minerals_Information__Chromium Statistics and information on the worldwide supply, demand, and flow of the element (PDF format). |
| Visual_Elements__Chromium General and physical information, source, uses, key isotopes, and ionisation energies. |
| WebElements__Chromium Extensive information on history, uses, occurrence, compounds, and properties of the element. |
| Wikipedia__Chromium Properties of the element, including its history, applications, and characteristics. |
| Radiochemistry_of_Chromium Full text of the monograph by J. Pijck (Laboratory for Analytical Chemistry, University of Ghent, Ghent, Belgium). (December, 1964) |
| ChemicalElements_com__Zirconium Basic information, atomic structure, and isotopes. |
| EnvironmentalChemistry_com__Zirconium Atomic structure, chemical and physical properties, and table of nuclides. |
| It\'s_Elemental__Zirconium Basic physical and historical information. |
| LANL__Zirconium History, isotopes, properties, and uses. |
| Lenntech__Zirconium Physical data, chemical properties, health and environmental effects. |
| USGS_Minerals_Information__Zirconium Statistics and information on the worldwide supply, demand, and flow of the element (PDF format). |
| Visual_Elements__Zirconium Image, uses, physical information, and ionisation energies. |
| WebElements__Zirconium Extensive information on history, uses, occurrence, compounds, and properties of the element. |
| Wikipedia__Zirconium Properties of the element, including its history, applications, and characteristics. |
| Zirconium Data tables and historic information. |
| ChemicalElements_com__Sodium Basic information, atomic structure, and table of isotopes. |
| EnvironmentalChemistry_com__Sodium Atomic structure, chemical and physical properties, and table of nuclides. |
| It\'s_Elemental__Sodium Basic physical and historical information. |
| LANL__Sodium Sources, properties, uses, and compounds. |
| Lenntech__Sodium Physical data, chemical properties, health and environmental effects. |
| Sodium Data tables and historic information. |
| Visual_Elements__Sodium Image, animation, source, uses, key isotopes, and ionisation energies. |
| WebElements__Sodium Extensive information on history, uses, occurrence, compounds, and properties of the element. |
| Wikipedia__Sodium Properties of the element, including its history, applications, and characteristics. |
| Radiochemistry_of_Sodium Full text of the monograph by W. T. Mullins and G. W. Leddicotte (Oak Ridge National Laboratory, Oak Ridge, Tennessee). [PDF] (March, 1962) |
| Calcium Data tables and historic information. |
| ChemicalElements_com__Calcium Basic information, atomic structure, and isotopes. |
| EnvironmentalChemistry_com__Calcium Atomic structure, chemical and physical properties, and table of nuclides. |
| It\'s_Elemental__Calcium Basic physical and historical information. |
| LANL__Calcium History, sources, properties, uses, and compounds. |
| Lenntech__Calcium Physical data, chemical properties, and health effects. |
| Visual_Elements__Calcium Image, animation, source, uses, and physical information. |
| WebElements__Calcium Extensive information on history, uses, occurrence, compounds, and properties of the element. |
| Wikipedia__Calcium Properties of the element, including its history, applications, and characteristics. |
| ChemicalElements_com__Tantalum Basic information, atomic structure, and isotopes. |
| EnvironmentalChemistry_com__Tantalum Atomic structure, chemical and physical properties, and table of nuclides. |
| It\'s_Elemental__Tantalum Basic physical and historical information. |
| LANL__Tantalum History, production, properties, and uses. |
| Lenntech__Tantalum Physical data, chemical properties, health and environmental effects. |
| Tantalum Data tables and historic information. |
