Periodic Table/Bohrium
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107Bh274 Da

Bohrium

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

Radioactive transition metal. Half-life of approximately 1/500 s. Discovered by the Joint Institute for Nuclear Research at Dubna (U.S.S.R.) in 1976. Confirmed by West German physicists at the Heavy Ion Research Laboratory at Darmstadt.

Gallery

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

Bohr model of Bohrium

Physical Propertiesmass · density · phase · crystal

Atomic Mass

274Da

Density

37.1000g/cm³

Phase (STP)

Solid

Melting Point

—

Boiling Point

—

Molar Heat

—

Crystal Structure

—

Atomic Radiiatomic · covalent · van der Waals

Atomic (Empirical)

—

Covalent

141.00pm

Van der Waals

—

Electronic Propertieselectronegativity · ionization · affinity

Electron Configuration

[Rn] 5f14 6d5 7s2

Electron Shells

2, 8, 18, 32, 32, 13, 2

Electronegativity

—

Electron Affinity

—

1st Ionization Energy

7.7kJ/mol

Oxidation States

+7

Orbital DiagramAufbau · Hund's rule · Pauli exclusion

↑↓
1s2
↑↓
2s2
↑↓
↑↓
↑↓
2p6
↑↓
3s2
↑↓
↑↓
↑↓
3p6
↑↓
↑↓
↑↓
↑↓
↑↓
3d10
↑↓
4s2
↑↓
↑↓
↑↓
4p6
↑↓
↑↓
↑↓
↑↓
↑↓
4d10
↑↓
↑↓
↑↓
↑↓
↑↓
↑↓
↑↓
4f14
↑↓
5s2
↑↓
↑↓
↑↓
5p6
↑↓
↑↓
↑↓
↑↓
↑↓
5d10
↑↓
6s2
↑↓
↑↓
↑↓
6p6
↑↓
↑↓
↑↓
↑↓
↑↓
↑↓
↑↓
5f14
↑
↑
↑
↑
↑
6d5
↑↓
7s2

Full: 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 6s2 6p6 5f14 6d5 7s2Short: [Rn] 5f14 6d5 7s2

Ionization Energies (72 known)

1st7.7 kJ/mol2nd17.5 kJ/mol3rd26.7 kJ/mol4th37.3 kJ/mol5th49.0 kJ/mol6th62.1 kJ/mol7th74.9 kJ/mol8th134.0 kJ/mol9th148.0 kJ/mol10th178.0 kJ/mol11th198.0 kJ/mol12th228.0 kJ/mol13th255.0 kJ/mol14th281.0 kJ/mol15th318.0 kJ/mol16th337.0 kJ/mol17th374.0 kJ/mol18th934.0 kJ/mol19th969.0 kJ/mol20th1008.0 kJ/mol21th1049.0 kJ/mol22th1088.0 kJ/mol23th1126.0 kJ/mol24th1197.0 kJ/mol25th1237.0 kJ/mol26th1280.0 kJ/mol27th1320.0 kJ/mol28th4216.0 kJ/mol29th4301.0 kJ/mol30th4390.0 kJ/mol31th4486.0 kJ/mol32th4580.0 kJ/mol33th4660.0 kJ/mol34th4890.0 kJ/mol35th4980.0 kJ/mol36th5080.0 kJ/mol37th5170.0 kJ/mol38th5550.0 kJ/mol39th5640.0 kJ/mol40th5740.0 kJ/mol41th5830.0 kJ/mol42th6650.0 kJ/mol43th6760.0 kJ/mol44th7040.0 kJ/mol45th7140.0 kJ/mol46th10930.0 kJ/mol47th11130.0 kJ/mol48th11340.0 kJ/mol49th11560.0 kJ/mol50th11780.0 kJ/mol51th11980.0 kJ/mol52th12610.0 kJ/mol53th12830.0 kJ/mol54th13070.0 kJ/mol55th13300.0 kJ/mol56th13900.0 kJ/mol57th14100.0 kJ/mol58th14300.0 kJ/mol59th14500.0 kJ/mol60th17000.0 kJ/mol61th17300.0 kJ/mol62th17700.0 kJ/mol63th18000.0 kJ/mol64th35200.0 kJ/mol65th35700.0 kJ/mol66th36300.0 kJ/mol67th36800.0 kJ/mol68th46100.0 kJ/mol69th46900.0 kJ/mol70th47800.0 kJ/mol71th187260.0 kJ/mol72th190329.0 kJ/molSuccessive Ionization Energies

Abundanceby mass

Biological Role

No biological role

Synthetic, radioactive element. No biological role.

Discovery

Discovered By

Heavy Ion Research Laboratory (HIRL)

Named By

—

Year

1976

Nuclear Data

Known Isotopes

19

Stable Isotopes

0

Stable Mass Numbers

None

Isotopes of Bh19 known

NuclideZNMass (AMU)Half-lifeDecayJπAbundance
260Bh107153260.12144341.0 msα (1%), β⁺, SF——
261Bh107154261.12139612.8 msα (1%), SF5/2-—
262Bh107155262.12265584.0 msα (1%), SF (0.2%)——
276Bh107169276.149169Unknownα, SF——
277Bh107170277.151477Unknownα, SF——
278Bh107171278.154988UnknownSF (1%), α——

Click any isotope for its full page with decay chain:

260Bh261Bh262Bh263Bh264Bh265Bh266Bh267Bh268Bh269Bh270Bh271Bh272Bh273Bh274Bh275Bh276Bh277Bh278Bh
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