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105 Db Dubnium [268]

Transition metal

Dubnium 𬭊

[Rn] 5f¹⁴ 6d³ 7s²

  • Period 7
  • Group 5
  • Block d
  • Solid

Electron configuration

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

Orbital diagram (valence)

6d ↑↑↑
7s ↑↓
Electrons per shell
2, 8, 18, 32, 32, 11, 2
Unpaired electrons
3
Zeff (Slater)
3.30

Properties

Atomic weight
[268]
Electronegativity (Pauling)
no data
First ionization energy
no data
Electron affinity
no data
Covalent radius
no data
van der Waals radius
no data
Melting point
no data
Boiling point
no data
Density
no data
Melting / boiling point
— / —
Common oxidation states
+5, +4, +3
Discovered
1967

Brackets give the mass number of the longest-lived isotope

Periodic trend

H: 1312 kJ/molHe: 2372 kJ/molLi: 520.2 kJ/molBe: 899.5 kJ/molB: 800.6 kJ/molC: 1086 kJ/molN: 1402 kJ/molO: 1314 kJ/molF: 1681 kJ/molNe: 2081 kJ/molNa: 495.8 kJ/molMg: 737.7 kJ/molAl: 577.6 kJ/molSi: 786.5 kJ/molP: 1012 kJ/molS: 999.6 kJ/molCl: 1251 kJ/molAr: 1521 kJ/molK: 418.8 kJ/molCa: 589.8 kJ/molSc: 633 kJ/molTi: 658.8 kJ/molV: 650.9 kJ/molCr: 652.9 kJ/molMn: 717.3 kJ/molFe: 762.4 kJ/molCo: 760.4 kJ/molNi: 737.1 kJ/molCu: 745.4 kJ/molZn: 906.4 kJ/molGa: 578.8 kJ/molGe: 762.2 kJ/molAs: 947 kJ/molSe: 940.9 kJ/molBr: 1140 kJ/molKr: 1351 kJ/molRb: 403 kJ/molSr: 549.5 kJ/molY: 599.8 kJ/molZr: 640.1 kJ/molNb: 652.1 kJ/molMo: 684.3 kJ/molTc: 702.4 kJ/molRu: 710.2 kJ/molRh: 719.7 kJ/molPd: 804.4 kJ/molAg: 731 kJ/molCd: 867.8 kJ/molIn: 558.3 kJ/molSn: 708.6 kJ/molSb: 833.6 kJ/molTe: 869.3 kJ/molI: 1008 kJ/molXe: 1170 kJ/molCs: 375.7 kJ/molBa: 502.9 kJ/molLa: 538.1 kJ/molCe: 534.4 kJ/molPr: 527.2 kJ/molNd: 533.1 kJ/molPm: 535.5 kJ/molSm: 544.6 kJ/molEu: 547.1 kJ/molGd: 593.4 kJ/molTb: 565.8 kJ/molDy: 573 kJ/molHo: 581 kJ/molEr: 589.3 kJ/molTm: 596.7 kJ/molYb: 603.4 kJ/molLu: 523.5 kJ/molHf: 658.5 kJ/molTa: 761.3 kJ/molW: 770 kJ/molRe: 760.3 kJ/molOs: 839.4 kJ/molIr: 878 kJ/molPt: 868.4 kJ/molAu: 890.2 kJ/molHg: 1007 kJ/molTl: 589.3 kJ/molPb: 715.6 kJ/molBi: 703.3 kJ/molPo: 812.1 kJ/molAt: 916.6 kJ/molRn: 1037 kJ/molFr: 376.3 kJ/molRa: 509.3 kJ/molAc: 498.8 kJ/molTh: 586.6 kJ/molPa: 568.3 kJ/molU: 597.6 kJ/molNp: 604.6 kJ/molPu: 584.7 kJ/molAm: 578.2 kJ/molCm: 580.8 kJ/molBk: 601.1 kJ/molCf: 607.9 kJ/molEs: 619.4 kJ/molFm: 627.2 kJ/molMd: 634.9 kJ/molNo: 641.6 kJ/mol 0102030405060708090100110Atomic number Z05001000150020002500First ionization energy / kJ/mol

Group 5

Data: PubChem periodic table (public domain); atomic weights are IUPAC abridged standard values; covalent radii from Cordero et al. (2008).