Tantalum
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Tantalum is a chemical element; it has symbol Ta and atomic number 73. It is named after Tantalus, a figure in Greek mythology. Tantalum is a very hard, ductile, lustrous, blue-gray transition metal t
Tantalum single crystal and 1cm 3 cube
Tantalite, Pilbara district, Australia
Tantalum electrolytic capacitor
Hafnium
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Hafnium is a chemical element; it has symbol Hf and atomic number 72. A lustrous, silvery gray, tetravalent transition metal, hafnium chemically resembles zirconium and is found in many zirconium mine
Tantalum
…metastable state) is predicted to decay in three ways: isomeric transition to the ground state of 180Ta, beta decay to 180W, or electron capture to 180Hf. However, radioactivity of this nuclear isomer has never been observed, and only a lower limit on its half-life of 2.9×1017 years has been set. The…
Hf crystal bar
Pieces of hafnium
Hafnium dioxide (HfO2)
Zircon crystal (2×2 cm) from Tocantins, Brazil