Periodic Table/Curium
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96Cm247 Da

Curium

Actinide·Period 7·f-block

Radioactive metallic transuranic element. Belongs to actinoid series. Nine known isotopes, Cm-247 has a half-life of 1.64*10^7 years. First identified by Glenn T. Seaborg and associates in 1944, first produced by L.B. Werner and I. Perlman in 1947 by bombarding americium-241 with Neutrons. Named for Marie Curie.

Gallery

A piece of curium, which emitts strong radiation that makes it glow

European Union, The Actinide Group, Institute for Transuranium Elements (JRC-ITU), source: https://images-of-elements.com/curium.php

Bohr model of Curium

Physical Propertiesmass · density · phase · crystal

Atomic Mass

247Da

Density

13.5100g/cm³

Phase (STP)

Solid

Melting Point

1618.2K

Boiling Point

—

Molar Heat

—

Crystal Structure

—

Atomic Radiiatomic · covalent · van der Waals

Atomic (Empirical)

—

Covalent

166.00pm

Van der Waals

245.00pm

Electronic Propertieselectronegativity · ionization · affinity

Electron Configuration

[Rn] 5f7 6d 7s2

Electron Shells

2, 8, 18, 32, 25, 9, 2

Electronegativity

—

Electron Affinity

—

1st Ionization Energy

6.0kJ/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
↑
↑
↑
↑
↑
↑
↑
5f7
↑
6d1
↑↓
7s2

Full: 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 6s2 6p6 5f7 6d1 7s2Short: [Rn] 5f7 6d 7s2

Ionization Energies (96 known)

1st6.0 kJ/mol2nd12.4 kJ/mol3rd20.1 kJ/mol4th37.7 kJ/mol5th51.0 kJ/mol6th69.1 kJ/mol7th97.0 kJ/mol8th112.0 kJ/mol9th128.0 kJ/mol10th144.0 kJ/mol11th167.0 kJ/mol12th190.0 kJ/mol13th213.0 kJ/mol14th235.0 kJ/mol15th253.0 kJ/mol16th272.0 kJ/mol17th311.0 kJ/mol18th332.0 kJ/mol19th460.0 kJ/mol20th489.0 kJ/mol21th518.0 kJ/mol22th550.0 kJ/mol23th580.0 kJ/mol24th611.0 kJ/mol25th657.0 kJ/mol26th689.0 kJ/mol27th723.0 kJ/mol28th755.0 kJ/mol29th910.0 kJ/mol30th950.0 kJ/mol31th990.0 kJ/mol32th1030.0 kJ/mol33th1140.0 kJ/mol34th1180.0 kJ/mol35th1300.0 kJ/mol36th1340.0 kJ/mol37th1480.0 kJ/mol38th1560.0 kJ/mol39th1650.0 kJ/mol40th1730.0 kJ/mol41th1810.0 kJ/mol42th1890.0 kJ/mol43th1980.0 kJ/mol44th2060.0 kJ/mol45th2160.0 kJ/mol46th2240.0 kJ/mol47th2320.0 kJ/mol48th2410.0 kJ/mol49th2490.0 kJ/mol50th2580.0 kJ/mol51th2976.0 kJ/mol52th3050.0 kJ/mol53th3125.0 kJ/mol54th3207.0 kJ/mol55th3284.0 kJ/mol56th3360.0 kJ/mol57th3515.0 kJ/mol58th3593.0 kJ/mol59th3679.0 kJ/mol60th3758.0 kJ/mol61th4078.0 kJ/mol62th4156.0 kJ/mol63th4239.0 kJ/mol64th4317.0 kJ/mol65th4791.0 kJ/mol66th4880.0 kJ/mol67th5110.0 kJ/mol68th5200.0 kJ/mol69th8270.0 kJ/mol70th8440.0 kJ/mol71th8620.0 kJ/mol72th8820.0 kJ/mol73th9000.0 kJ/mol74th9180.0 kJ/mol75th9630.0 kJ/mol76th9820.0 kJ/mol77th10020.0 kJ/mol78th10220.0 kJ/mol79th10760.0 kJ/mol80th10920.0 kJ/mol81th11100.0 kJ/mol82th11270.0 kJ/mol83th12740.0 kJ/mol84th12950.0 kJ/mol85th13350.0 kJ/mol86th13550.0 kJ/mol87th27740.0 kJ/mol88th28180.0 kJ/mol89th28700.0 kJ/mol90th29100.0 kJ/mol91th34600.0 kJ/mol92th35200.0 kJ/mol93th36000.0 kJ/mol94th36493.0 kJ/mol95th143311.0 kJ/mol96th145740.1 kJ/molSuccessive Ionization Energies

Emission Spectrumvisible range · characteristic spectral lines

412
432
Cm emission
380nm750nm
412.0 nm(100%)432.0 nm(40%)

Abundanceby mass

Biological Role

Toxic

Radioactive. Cm-244 used as power source in space probes.

Discovery

Discovered By

G.T.Seaborg, R.A.James, A.Ghiorso

Named By

—

Year

1944

Nuclear Data

Known Isotopes

22

Stable Isotopes

0

Stable Mass Numbers

None

Isotopes of Cm22 known

NuclideZNMass (AMU)Half-lifeDecayJπAbundance
231Cm96135231.050746Unknownβ⁺, α3/2+—
232Cm96136232.049740Unknownβ⁺, α0+—
233Cm96137233.05077127.0 sα (0.2%), β⁺ (0.8%)3/2+—
250Cm96154250.078358UnknownSF (0.74%), α, β⁻0+—
251Cm96155251.08228516.8 minβ⁻ (1%)3/2+—
252Cm96156252.084870Unknownβ⁻, α0+—

Click any isotope for its full page with decay chain:

231Cm232Cm233Cm234Cm235Cm236Cm237Cm238Cm239Cm240Cm241Cm242Cm243Cm244Cm245Cm246Cm247Cm248Cm249Cm250Cm251Cm252Cm
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