Dubnium Db (Element 105) of Periodic Table

105 Db (Dubnium)

Mass number – 268

Atomic number (Z) – 105

Atomic weight – 262 g/mol

Electrons – 105

Protons – 105

Neutrons – 163

Group 5

Period – 7

Block – d

Element category – Transition metal

Electrons per shell – K2, L8, M18, N32, O32, P11, Q2

Electron configuration – 1s²2s²2p⁶3s²3p⁶3d¹⁰4s²4p⁶4d¹⁰5s²5p⁶4f¹⁴5d¹⁰6s²6p⁶5f¹⁴6d³7s²

Phase – Solid

Density – 29.3 g/cm³

Half Life(s) – 20000

Lifetime(s) – 30000

Appearance – Highly Radioactive metal

Oxidation states – 5, 4, 3

Ionization energies – 1st: 656.1 kJ/mol, 2nd: 1546.7 kJ/mol, 3rd:2378.4 kJ/mol

Atomic radius – 139 pm

Covalent radius – 149 pm

Crystal structure – Body-centered cubic

CAS Number – 53850-35-4

Naming – After Dubna, Moscow Oblast, Russia (Site of the JINR)

Discovery – Independently by the University of California and the (JINR)Joint Institute for Nuclear Research (1970)

Isotopes – 262_Db 263_Db 266_Db 267_Db 268_Db 270_Db

Uses – At present, it is only used in research.

Natural abundance –  It is a transuranium element created by bombarding californium-249 with nitrogen-15 nuclei

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