actinide
ac·ti·nide / ˈaktəˌnīd/ • n. Chem. any of the series of fifteen metallic elements from actinium (atomic number 89) to lawrencium (atomic number 103) in the periodic table. They are all radioactive, the heavier members being extremely unstable and not of natural occurrence.
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Radium , radium (rā´dēəm) [Lat. radius=ray], radioactive metallic chemical element; symbol Ra; at. no. 88; mass number of most stable isotope 226; m.p. 700°C;… Zirconium , zirconium (zərkō´nēəm), metallic chemical element; symbol Zr; at. no. 40; at. wt. 91.224; m.p. about 1,852°C; b.p. 4,377°C; sp. gr. 6.5 at 20°C; vale… Rhodium , Rhodium (revised)
Note: This article, originally published in 1998, was updated in 2006 for the eBook edition.
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Rhodium is considered to be a… Periodic Table of the Elements Rubidium , rubidium (symbol Rb) Silver-white metallic element of the alkali metals (group I of the periodic table). It ignites spontaneously in air and can be l… Tantalum , Tantalum (revised)
Note: This article, originally published in 1998, was updated in 2006 for the eBook edition.
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Tantalum is a transition met… Tungsten , Tungsten (revised)
Note: This article, originally published in 1998, was updated in 2006 for the eBook edition.
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