Db

Dubnium

Identification

CAS Number: 53850-35-4

Discovery Year: 1970

Discoverer: A. Ghiorso, et al

Discovery Location: United States

Properties

Atomic Mass: 268 →Density: 29.3 g/cm³ →

Electronic Structure

Electron Config: [Rn] 5f14 6d3 7s2

Block: d

Period: 7 →Group: 5 →

Abundance & Geochemistry

Goldschmidt Class: synthetic

About

Also known as Hahnium, Ha. Radioactive transactinide element. Half-life of 1.6s. Discovered in 1970 by Berkeley researchers. So far, seven isotopes have been discovered.

Isotopes

Db-268 268 ☢ 30.8 h

Db-270 270 ☢ 90.0 h