Dubnium

Atomic symbol: Db
Atomic number: 105
Atomic mass: 268

Appearance: Solid at 25°C

Group: 5
Period: 7
Series: Transition metals
Block: d
Electron configuration: 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 5s² 5p⁶ 4f¹⁴ 5d¹⁰ 6s² 6p⁶ 5f¹⁴ 6d³ 7s²

A highly radioactive, synthetic metal.

Transactinide/ super-heavy element.

Fun Fact! Dubnium is named after Dubna in Russia, the town where it was first synthesized.

https://www.softschools.com/facts/periodic_table/dubnium_facts/707/