Dubnium is a synthetic chemical element; it has symbol Db and atomic number 105. It is highly radioactive: the most stable known isotope , dubnium-268, has a half-life of about 16 hours. This greatly limits extended research on the element.

Element Dubnium (Db), Group 5, Atomic Number 105, d-block, Mass [268]. Sources, facts, uses, scarcity (SRI), podcasts, alchemical symbols, videos and images.

2019年7月25日 · Dubnium is a super-heavy or transactinide element. If a sufficient amount were ever produced, its chemical properties are expected to be similar to that of the transition metals. It would be most similar to the element tantalum. Dubnium was first made by bombarding americium-243 with neon-22 atoms. All isotopes of dubnium are radioactive. The ...

dubnium (Db), an artificially produced radioactive transuranium element in Group Vb of the periodic table, atomic number 105. The discovery of dubnium (element 105), like that of rutherfordium (element 104), has been a matter of dispute between Soviet and …

Dubnium is a chemical element with symbol Db and atomic number 105. Classified as a transition metal, Dubnium is a solid at room temperature. 6.8 ± 0.5 eV (Theoretical value.)

Dubnium is a transition metal that belongs to the 6d series, group 5 of the periodic table. It is placed under niobium, vanadium and tantalum and is predicted to have similarity with these elements, especially niobium.

2024年3月8日 · Dubnium is a synthetic transition metal with an atomic number of 105 and is represented by the symbol ‘Db’ in the periodic table. It is silvery in appearance and belongs to the d-block of period 7 of the periodic table. Dubnium was the second transactinide (super-heavy) element to be identified.

The chemical element dubnium is classed as a transition metal. It was discovered in 1970 by a team of scientists led by Georgy Flerov. Part of the heavy ion cyclotron U400 in Dubna, Russia. Image by Jim Roberto, Oak Ridge National Laboratory.

2020年4月8日 · Dubnium is a man-made highly radioactive and unstable element with the periodic table symbol Db, atomic number 105, atomic mass of 261.9 g.mol-1, an estimated atomic radius of 139 pm, and electron configuration of [Rn] 5f 14 6d 3 7s 2.

Dubnium - Properties, history, name origin, facts, applications, isotopes, electronic configuation, crystal structure, hazards and more; Interactive periodic table of the chemical elements.