Technetium

Technetium is a chemical element with the symbol Tc and atomic number 43. It is a silvery-gray metal that is radioactive and has no stable isotopes. Technetium is primarily used in medical imaging and as a tracer in various applications.

Overview

English Name:

Technetium

Latin Name:

Technetium

Year Discovered:

1937

Discovered By:

Group:

7

Period:

5

Electrons:

43

CAS Number:

7440-26-8

Cost Per 100 Grams:

$100

Atomic Properties

Electronic Configuration:

[Kr] 5s² 4d⁵

Ion Charge:

+7

Ionisation Energies:

702 kJ/mol

Atomic Radius (Empirical):

139 pm

Atomic Radius (Calculated):

210 pm

Covalent Radius:

160 pm

Van Der Waals Radius:

N/A

Ionisation Potential of An Atom:

7.28 eV

Electrons Per Layer:

2, 8, 18, 13, 2

Atomic Multiplicities Of The Gas:

1

Atomic Weight:

98

Oxidation States

+4

Reactivity

Electron Affinity:

−48 kJ/mol

Valence:

7

Electronegativity:

1.9

Thermal Properties

Melting Point:

2157°C

Boiling Point:

4265°C

Critical Point:

Pressure: N/A

Temperature: N/A

Thermal Conductivity:

54 W/(m·K)

Heat Capacity:

Specific: 0.24 J/(g·K)

Molar: 25.0 J/(mol·K)

Thermal Coefficient:

0.000006

Enthalpy:

Fusion: 12.6 kJ/mol

Vaporisation: 400 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: 10.28 g/cm³

Molar Volume (Vmol):

9.57 L/mol

Speed of Sound (Vs):

5000 m/s

Hardness:

N/A

Bulk Modulus (K):

170 GPa

Shear Modulus (G):

N/A

Young's Modulus (E):

N/A

Color:

Silvery-gray

Brinell Hardness (MPa):

N/A

Liquid Density (Kg/m^3):

N/A

Hardness of Mohs:

N/A

Refractive Index:

N/A

Vickers Hardness (MPa):

N/A

Crystal Structure:

Hexagonal

Electromagnetic Properties

Electrical Type:

Conductor

Resistivity:

1.0 × 10^-7 Ω·m

Magnetic Type:

Paramagnetic

Superconductivity:

Not applicable

Volume Magnetic Susceptibility:

+1.0 × 10^-5

Mass Magnetic Susceptibility:

+1.2 × 10^-5 m³/kg

Molar Mass Susceptibility:

+2.0 × 10^-4 m³/mol

Electrical Conductivity:

10^6 S/m

Mass (γmass):

1.0 × 10-25 kg

Mass (γmol):

1.0 × 10-22 mol

Volume (γvol):

9.57 L

Grid Parameters

Crystal Structure:

Hexagonal

Grid Parameters:

N/A

Attitude:

N/A

Debye Temperature:

N/A

Safety and Precautions

Signal Word:

Warning

Hazard Statements:

H228

Precautionary Statements:

P220, P244, P370 + P376

RTECS Number:

Not available

Risk:

Flammability: Flammable
Health Risk: Irritant
Reactivity: Stable
Specific Risk: None

Importance

Main sources:

Technetium ores

Main Usage:

Medical imaging, radiopharmaceuticals

Nuclear Properties

Radioactive:

Yes

Isotopes:

Tc-98, Tc-99m

Neutron Cross Sectional:

0.1 barns

Half Life (s):

6 hours (Tc-99m)

Lifetime:

Stable (Tc-98)

Prevalence

Universe:

0.00002%

Sun:

0.00002%

Oceans:

0.00001%

Humans:

0.00001%

Earth's Crust:

0.0001%

Meteorites:

0.0001%