Periodic Table/Dubnium
← RfSg →
105Db268 Da

Dubnium

Transition Metal·Period 7, Group 5·s-block

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.

Gallery

No Image Found

Chemical Elements A Virtual Museum under a Creative Commons Attribution 3.0 Unported License, source: https://images-of-elements.com/dubnium.php

Bohr model of Dubnium

Physical Propertiesmass · density · phase · crystal

Atomic Mass

268Da

Density

29.3000g/cm³

Phase (STP)

Solid

Melting Point

—

Boiling Point

—

Molar Heat

—

Crystal Structure

—

Atomic Radiiatomic · covalent · van der Waals

Atomic (Empirical)

—

Covalent

149.00pm

Van der Waals

—

Electronic Propertieselectronegativity · ionization · affinity

Electron Configuration

[Rn] 5f14 6d3 7s2

Electron Shells

2, 8, 18, 32, 32, 11, 2

Electronegativity

—

Electron Affinity

—

1st Ionization Energy

6.8kJ/mol

Oxidation States

+5

Orbital DiagramAufbau · Hund's rule · Pauli exclusion

↑↓
1s2
↑↓
2s2
↑↓
↑↓
↑↓
2p6
↑↓
3s2
↑↓
↑↓
↑↓
3p6
↑↓
↑↓
↑↓
↑↓
↑↓
3d10
↑↓
4s2
↑↓
↑↓
↑↓
4p6
↑↓
↑↓
↑↓
↑↓
↑↓
4d10
↑↓
↑↓
↑↓
↑↓
↑↓
↑↓
↑↓
4f14
↑↓
5s2
↑↓
↑↓
↑↓
5p6
↑↓
↑↓
↑↓
↑↓
↑↓
5d10
↑↓
6s2
↑↓
↑↓
↑↓
6p6
↑↓
↑↓
↑↓
↑↓
↑↓
↑↓
↑↓
5f14
↑
↑
↑
6d3
↑↓
7s2

Full: 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 6s2 6p6 5f14 6d3 7s2Short: [Rn] 5f14 6d3 7s2

Ionization Energies (70 known)

1st6.8 kJ/mol2nd14.0 kJ/mol3rd23.1 kJ/mol4th33.0 kJ/mol5th43.0 kJ/mol6th86.0 kJ/mol7th98.9 kJ/mol8th126.0 kJ/mol9th145.1 kJ/mol10th172.0 kJ/mol11th196.0 kJ/mol12th220.9 kJ/mol13th254.0 kJ/mol14th274.0 kJ/mol15th307.0 kJ/mol16th838.0 kJ/mol17th872.0 kJ/mol18th908.0 kJ/mol19th948.0 kJ/mol20th985.0 kJ/mol21th1022.0 kJ/mol22th1089.0 kJ/mol23th1126.0 kJ/mol24th1168.0 kJ/mol25th1207.0 kJ/mol26th3975.0 kJ/mol27th4057.0 kJ/mol28th4145.0 kJ/mol29th4237.0 kJ/mol30th4326.0 kJ/mol31th4411.0 kJ/mol32th4620.0 kJ/mol33th4710.0 kJ/mol34th4810.0 kJ/mol35th4900.0 kJ/mol36th5260.0 kJ/mol37th5350.0 kJ/mol38th5450.0 kJ/mol39th5530.0 kJ/mol40th6280.0 kJ/mol41th6380.0 kJ/mol42th6650.0 kJ/mol43th6760.0 kJ/mol44th10420.0 kJ/mol45th10610.0 kJ/mol46th10820.0 kJ/mol47th11040.0 kJ/mol48th11240.0 kJ/mol49th11440.0 kJ/mol50th12040.0 kJ/mol51th12250.0 kJ/mol52th12480.0 kJ/mol53th12700.0 kJ/mol54th13300.0 kJ/mol55th13500.0 kJ/mol56th13700.0 kJ/mol57th13900.0 kJ/mol58th16200.0 kJ/mol59th16400.0 kJ/mol60th16900.0 kJ/mol61th17100.0 kJ/mol62th33800.0 kJ/mol63th34300.0 kJ/mol64th34800.0 kJ/mol65th35300.0 kJ/mol66th43800.0 kJ/mol67th44500.0 kJ/mol68th45400.0 kJ/mol69th178505.0 kJ/mol70th181445.0 kJ/molSuccessive Ionization Energies

Abundanceby mass

Biological Role

No biological role

Synthetic, radioactive element. No biological role.

Discovery

Discovered By

A. Ghiorso, et al

Named By

—

Year

1970

Nuclear Data

Known Isotopes

16

Stable Isotopes

0

Stable Mass Numbers

None

Isotopes of Db16 known

NuclideZNMass (AMU)Half-lifeDecayJπAbundance
255Db105150255.10691954.0 msSF (0.67%), α9/2+—
256Db105151256.1076741.70 sα (0.7%), β⁺ (0.3%), SF9-—
257Db105152257.1075202.30 sα (0.94%), SF (0.06%), β⁺9/2+—
268Db105163268.1256691.21 dSF (1%), β⁺, α——
269Db105164269.127911Unknownα, SF9/2+—
270Db105165270.1313991.70 hSF (0.87%), α (0.13%)——

Click any isotope for its full page with decay chain:

255Db256Db257Db258Db259Db260Db261Db262Db263Db264Db265Db266Db267Db268Db269Db270Db
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