Astatine

Overview

English Name:

Astatine

Latin Name:

Astatinum

Year Discovered:

1940

Discovered By:

Emilio Segrè, Glenn T. Seaborg

Group:

17

Period:

6

Electrons:

85

CAS Number:

7440-38-2

Cost Per 100 Grams:

$1000

Atomic Properties

Electronic Configuration:

[Xe] 4f¹⁴ 5d¹⁰ 6s² 6p⁵

Ion Charge:

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

Ionisation Energies:

900 kJ/mol

Atomic Radius (Empirical):

202 pm

Atomic Radius (Calculated):

270 pm

Covalent Radius:

202 pm

Van Der Waals Radius:

202 pm

Ionisation Potential of An Atom:

9.3 eV

Electrons Per Layer:

2, 8, 18, 32, 18, 7

Atomic Multiplicities Of The Gas:

1

Atomic Weight:

210

Reactivity

Electron Affinity:

Not well defined

Valence:

1, 3, 5, 7

Electronegativity:

2.2

Thermal Properties

Melting Point:

337 °C

Boiling Point:

610 °C

Critical Point:

Pressure: N/A

Temperature: N/A

Thermal Conductivity:

0.16 W/(m·K)

Heat Capacity:

Specific: 0.128 J/(g·K)

Molar: 26.4 J/(mol·K)

Thermal Coefficient:

0.0001

Enthalpy:

Fusion: 0.5 kJ/mol

Vaporisation: 1.5 kJ/mol

Atomization: 200 kJ/mol

Curie Temperature:

N/A

Neel Temperature:

N/A

Superconductivity Point:

N/A

Physical and Chemical Properties

State of matter (25° C/ 77°F):

Solid

Density:

Solid: 7.0 g/cm³

Molar Volume (Vmol):

30.0 cm³/mol

Speed of Sound (Vs):

Not applicable

Hardness:

N/A

Bulk Modulus (K):

Not available

Shear Modulus (G):

N/A

Young's Modulus (E):

N/A

Color:

Black

Brinell Hardness (MPa):

N/A

Liquid Density (Kg/m^3):

Not applicable

Hardness of Mohs:

N/A

Refractive Index:

N/A

Vickers Hardness (MPa):

N/A

Crystal Structure:

N/A

Electromagnetic Properties

Electrical Type:

Semiconductor

Resistivity:

10^5 Ω·m

Magnetic Type:

Diamagnetic

Superconductivity:

Not applicable

Volume Magnetic Susceptibility:

-1.0 × 10^-5

Mass Magnetic Susceptibility:

-1.2 × 10^-5 m³/kg

Molar Mass Susceptibility:

-2.5 × 10^-4 m³/mol

Electrical Conductivity:

10^-5 S/m

Mass (γ_mass):

2.0 × 10^-25 kg

Mass (γ_mol):

2.0 × 10^-22 mol

Volume (γ_vol):

30.0 L

Grid Parameters

Crystal Structure:

N/A

Grid Parameters:

N/A

Attitude:

N/A

Debye Temperature:

N/A

Safety and Precautions

Signal Word:

Danger

Hazard Statements:

H300, H310, H330

Precautionary Statements:

P201, P202, P280, P308 + P313

RTECS Number:

Not available

Risk:

Flammability: Non-flammable
Health Risk: Highly toxic
Reactivity: Unstable
Specific Risk: Radioactive

Importance

Main sources:

Uranium ores

Main Usage:

Cancer therapy, nuclear medicine

Nuclear Properties

Radioactive:

Yes

Isotopes:

At-210, At-211, At-212

Neutron Cross Sectional:

0.1 barns

Half Life (s):

8.1 hours

Lifetime:

Stable

Prevalence

Universe:

0.0000000001%

Sun:

0.0000000001%

Oceans:

0.00000000001%

Humans:

0.000000000001%

Earth's Crust:

0.0000001%

Meteorites:

0.0000001%