Periodic Table/Berkelium
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97Bk247 Da

Berkelium

Actinide·Period 7·f-block

Radioactive metallic transuranic element. Belongs to actinoid series. Eight known isotopes, the most common Bk-247, has a half-life of 1.4*10^3 years. First produced by Glenn T. Seaborg and associates in 1949 by bombarding americium-241 with alpha particles.

Gallery

It took 250 days to make enough berkelium, shown here (in dissolved state), to synthesize element 117

ORNL, Department of Energy, Public domain, via Wikimedia Commons

Bohr model of Berkelium

Physical Propertiesmass · density · phase · crystal

Atomic Mass

247Da

Density

14.7800g/cm³

Phase (STP)

Solid

Melting Point

1259.2K

Boiling Point

—

Molar Heat

—

Crystal Structure

—

Atomic Radiiatomic · covalent · van der Waals

Atomic (Empirical)

—

Covalent

168.00pm

Van der Waals

244.00pm

Electronic Propertieselectronegativity · ionization · affinity

Electron Configuration

[Rn] 5f9 7s2

Electron Shells

2, 8, 18, 32, 27, 8, 2

Electronegativity

—

Electron Affinity

—

1st Ionization Energy

6.2kJ/mol

Oxidation States

+3, +4

Orbital DiagramAufbau · Hund's rule · Pauli exclusion

↑↓
1s2
↑↓
2s2
↑↓
↑↓
↑↓
2p6
↑↓
3s2
↑↓
↑↓
↑↓
3p6
↑↓
↑↓
↑↓
↑↓
↑↓
3d10
↑↓
4s2
↑↓
↑↓
↑↓
4p6
↑↓
↑↓
↑↓
↑↓
↑↓
4d10
↑↓
↑↓
↑↓
↑↓
↑↓
↑↓
↑↓
4f14
↑↓
5s2
↑↓
↑↓
↑↓
5p6
↑↓
↑↓
↑↓
↑↓
↑↓
5d10
↑↓
6s2
↑↓
↑↓
↑↓
6p6
↑↓
↑↓
↑
↑
↑
↑
↑
5f9
↑↓
7s2

Full: 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 6s2 6p6 5f9 7s2Short: [Rn] 5f9 7s2

Ionization Energies (97 known)

1st6.2 kJ/mol2nd11.9 kJ/mol3rd21.6 kJ/mol4th36.0 kJ/mol5th56.0 kJ/mol6th70.1 kJ/mol7th90.0 kJ/mol8th114.0 kJ/mol9th130.0 kJ/mol10th147.0 kJ/mol11th171.0 kJ/mol12th195.0 kJ/mol13th218.0 kJ/mol14th240.0 kJ/mol15th259.0 kJ/mol16th279.0 kJ/mol17th303.0 kJ/mol18th339.0 kJ/mol19th361.0 kJ/mol20th497.0 kJ/mol21th526.0 kJ/mol22th557.0 kJ/mol23th590.0 kJ/mol24th621.0 kJ/mol25th652.0 kJ/mol26th700.0 kJ/mol27th733.0 kJ/mol28th768.0 kJ/mol29th800.0 kJ/mol30th960.0 kJ/mol31th1000.0 kJ/mol32th1040.0 kJ/mol33th1080.0 kJ/mol34th1200.0 kJ/mol35th1240.0 kJ/mol36th1360.0 kJ/mol37th1410.0 kJ/mol38th1550.0 kJ/mol39th1630.0 kJ/mol40th1720.0 kJ/mol41th1800.0 kJ/mol42th1890.0 kJ/mol43th1970.0 kJ/mol44th2050.0 kJ/mol45th2140.0 kJ/mol46th2240.0 kJ/mol47th2320.0 kJ/mol48th2410.0 kJ/mol49th2490.0 kJ/mol50th2580.0 kJ/mol51th2670.0 kJ/mol52th3080.0 kJ/mol53th3154.0 kJ/mol54th3232.0 kJ/mol55th3315.0 kJ/mol56th3393.0 kJ/mol57th3469.0 kJ/mol58th3630.0 kJ/mol59th3709.0 kJ/mol60th3797.0 kJ/mol61th3877.0 kJ/mol62th4202.0 kJ/mol63th4281.0 kJ/mol64th4365.0 kJ/mol65th4445.0 kJ/mol66th4940.0 kJ/mol67th5040.0 kJ/mol68th5270.0 kJ/mol69th5360.0 kJ/mol70th8500.0 kJ/mol71th8670.0 kJ/mol72th8850.0 kJ/mol73th9050.0 kJ/mol74th9240.0 kJ/mol75th9420.0 kJ/mol76th9880.0 kJ/mol77th10070.0 kJ/mol78th10280.0 kJ/mol79th10480.0 kJ/mol80th11020.0 kJ/mol81th11190.0 kJ/mol82th11380.0 kJ/mol83th11550.0 kJ/mol84th13090.0 kJ/mol85th13300.0 kJ/mol86th13720.0 kJ/mol87th13910.0 kJ/mol88th28380.0 kJ/mol89th28800.0 kJ/mol90th29300.0 kJ/mol91th29800.0 kJ/mol92th35500.0 kJ/mol93th36200.0 kJ/mol94th37000.0 kJ/mol95th37457.6 kJ/mol96th146917.0 kJ/mol97th149398.0 kJ/molSuccessive Ionization Energies

Abundanceby mass

Biological Role

No biological role

Synthetic, radioactive element. No biological role.

Discovery

Discovered By

G.T.Seaborg, S.G.Tompson, A.Ghiorso

Named By

—

Year

1949

Nuclear Data

Known Isotopes

22

Stable Isotopes

0

Stable Mass Numbers

None

Isotopes of Bk22 known

NuclideZNMass (AMU)Half-lifeDecayJπAbundance
233Bk97136233.05665240.0 sα (0.82%), β⁺3/2-—
234Bk97137234.05732220.0 sα (0.8%), β⁺ (0.2%)3-—
235Bk97138235.056651Unknownβ⁺, α3/2-—
252Bk97155252.0843101.80 minβ⁻, α——
253Bk97156253.086880Unknownβ⁻3/2-—
254Bk97157254.090600Unknownβ⁻——

Click any isotope for its full page with decay chain:

233Bk234Bk235Bk236Bk237Bk238Bk239Bk240Bk241Bk242Bk243Bk244Bk245Bk246Bk247Bk248Bk249Bk250Bk251Bk252Bk253Bk254Bk
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