| 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. |
| Visual_Elements__Tantalum Discovery, uses, physical information, and key isotopes. |
| WebElements__Tantalum Extensive information on history, uses, occurrence, compounds, and properties. |
| Wikipedia__Tantalum Properties of the element, including its history, applications, and characteristics. |
| ChemicalElements__Seaborgium Basic information. |
| EnvironmentalChemistry_com__Seaborgium Atomic structure and table of nuclides. |
| It\'s_Elemental__Seaborgium Basic physical and historical information. |
| LANL__Seaborgium Basic information and history. |
| Lenntech__Seaborgium Physical data and chemical properties. |
| Seaborgium Historic information. |
| Visual_Elements__Seaborgium Physical information, ionisation energies, and key isotopes. |
| WebElements__Seaborgium Information on history, isolation, and properties. |
| Wikipedia__Seaborgium History and basic information on the element. |