Periodic Table/Astatine
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85At210 Da

Astatine

Halogen·Period 6, Group 17·p-block

Radioactive halogen element. Occurs naturally from uranium and thorium decay. At least 20 known isotopes. At-210, the most stable, has a half-life of 8.3 hours. Synthesized by nuclear bombardment in 1940 by D.R. Corson, K.R. MacKenzie and E. Segre at the University of California.

Gallery

This is only an illustration, not astatine itself. Crystals similar to iodine, but darker in color than these, which due to the extreme radioactivity glow blue and evaporate to dark purple gas

Chemical ELements A Virtual Museum, CC BY 3.0 <https://creativecommons.org/licenses/by/3.0> source: https://images-of-elements.com/astatine.php

Bohr model of Astatine

Physical Propertiesmass · density · phase · crystal

Atomic Mass

210Da

Density

7g/cm³

Phase (STP)

Solid

Melting Point

575.1K

Boiling Point

—

Molar Heat

—

Crystal Structure

—

Atomic Radiiatomic · covalent · van der Waals

Atomic (Empirical)

—

Covalent

147.00pm

Van der Waals

202.00pm

Electronic Propertieselectronegativity · ionization · affinity

Electron Configuration

[Xe] 4f14 5d10 6s2 6p5

Electron Shells

2, 8, 18, 32, 18, 7

Electronegativity

2.20Pauling

Electron Affinity

2.8kJ/mol

1st Ionization Energy

9.3kJ/mol

Oxidation States

-1, +1, +3, +5, +7

Orbital DiagramAufbau · Hund's rule · Pauli exclusion

↑↓
1s2
↑↓
2s2
↑↓
↑↓
↑↓
2p6
↑↓
3s2
↑↓
↑↓
↑↓
3p6
↑↓
↑↓
↑↓
↑↓
↑↓
3d10
↑↓
4s2
↑↓
↑↓
↑↓
4p6
↑↓
↑↓
↑↓
↑↓
↑↓
4d10
↑↓
5s2
↑↓
↑↓
↑↓
5p6
↑↓
↑↓
↑↓
↑↓
↑↓
↑↓
↑↓
4f14
↑↓
↑↓
↑↓
↑↓
↑↓
5d10
↑↓
6s2
↑↓
↑↓
↑
6p5

Full: 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6 4f14 5d10 6s2 6p5Short: [Xe] 4f14 5d10 6s2 6p5

Ionization Energies (85 known)

1st9.3 kJ/mol2nd17.9 kJ/mol3rd26.6 kJ/mol4th39.6 kJ/mol5th50.4 kJ/mol6th72.0 kJ/mol7th85.1 kJ/mol8th130.1 kJ/mol9th149.0 kJ/mol10th169.0 kJ/mol11th192.1 kJ/mol12th212.0 kJ/mol13th236.0 kJ/mol14th263.0 kJ/mol15th287.0 kJ/mol16th311.0 kJ/mol17th335.0 kJ/mol18th452.0 kJ/mol19th481.0 kJ/mol20th510.0 kJ/mol21th540.0 kJ/mol22th600.0 kJ/mol23th630.0 kJ/mol24th720.0 kJ/mol25th750.0 kJ/mol26th790.0 kJ/mol27th860.0 kJ/mol28th920.0 kJ/mol29th990.0 kJ/mol30th1050.0 kJ/mol31th1120.0 kJ/mol32th1180.0 kJ/mol33th1250.0 kJ/mol34th1320.0 kJ/mol35th1380.0 kJ/mol36th1450.0 kJ/mol37th1510.0 kJ/mol38th1590.0 kJ/mol39th1650.0 kJ/mol40th1948.0 kJ/mol41th2007.0 kJ/mol42th2071.0 kJ/mol43th2139.0 kJ/mol44th2203.0 kJ/mol45th2266.0 kJ/mol46th2373.0 kJ/mol47th2439.0 kJ/mol48th2510.0 kJ/mol49th2576.0 kJ/mol50th2841.0 kJ/mol51th2905.0 kJ/mol52th2977.0 kJ/mol53th3042.0 kJ/mol54th3312.0 kJ/mol55th3388.0 kJ/mol56th3573.0 kJ/mol57th3649.0 kJ/mol58th5976.0 kJ/mol59th6122.0 kJ/mol60th6279.0 kJ/mol61th6445.0 kJ/mol62th6604.0 kJ/mol63th6759.0 kJ/mol64th7068.0 kJ/mol65th7230.0 kJ/mol66th7410.0 kJ/mol67th7570.0 kJ/mol68th8030.0 kJ/mol69th8180.0 kJ/mol70th8330.0 kJ/mol71th8480.0 kJ/mol72th9330.0 kJ/mol73th9500.0 kJ/mol74th9830.0 kJ/mol75th9990.0 kJ/mol76th21210.0 kJ/mol77th21600.0 kJ/mol78th22030.0 kJ/mol79th22420.0 kJ/mol80th25580.0 kJ/mol81th26090.0 kJ/mol82th26730.0 kJ/mol83th27139.0 kJ/mol84th107930.0 kJ/mol85th109887.2 kJ/molSuccessive Ionization Energies

Emission Spectrumvisible range · characteristic spectral lines

500
At emission
380nm750nm
500.0 nm(100%)

Abundanceby mass

Biological Role

No biological role

Extremely rare and radioactive. No biological role.

Discovery

Discovered By

D.R.Corson, K.R.MacKenzie, E.Segré

Named By

—

Year

1940

Nuclear Data

Known Isotopes

39

Stable Isotopes

0

Stable Mass Numbers

None

Isotopes of At39 known

NuclideZNMass (AMU)Half-lifeDecayJπAbundance
191At85106191.0041482.10 msα (1%), β⁺1/2+—
192At85107192.00314111.5 msα (1%), β⁺, β⁺SF (0.0051%)3+—
193At85108192.99992829.0 msα (1%)1/2+—
227At85142227.040183Unknownβ⁻, β⁻n1/2+—
228At85143228.044960Unknownβ⁻, β⁻n3+—
229At85144229.048191Unknownβ⁻, β⁻n1/2+—

Click any isotope for its full page with decay chain:

191At192At193At194At195At196At197At198At199At200At201At202At203At204At205At206At207At208At209At210At211At212At213At214At215At216At217At218At219At220At221At222At223At224At225At226At227At228At229At
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