Thallium Properties

Thallium

Physical

Melting Point

303.50 °C 69

Boiling Point

1,457.00 °C 60

Hardness

Mohs Hardness

1.20 20

Brinell Hardness

26.50 MPa 50

Vickers Hardness

Not Available 0

Optical Properties

Refractive Index

Not Available 0

Reflectivity

Not Available 0

Speed of Sound

818.00 m/s 53

Allotropes

No 0

α Allotropes

Not Available 0

β Allotropes

Not Available 0

γ Allotropes

Not Available 0

Chemical

Chemical Formula

Tl 0

Isotopes

Known Isotopes

32 7

Electronegativity

Pauling Electronegativity

1.62 21

Sanderson Electronegativity

2.25 5

Allred Rochow Electronegativity

1.44 17

Mulliken-Jaffe Electronegativity

1.96 6

Allen Electronegativity

1.79 13

Electropositivity

Pauling Electropositivity

2.38 33

Ionization Energies

1st Energy Level

589.40 kJ/mol 58

2nd Energy Level

1,971.00 kJ/mol 14

3rd Energy Level

2,878.00 kJ/mol 32

Electrochemical Equivalent

7.63 g/amp-hr 2

Electron Work Function

3.84 eV 28

Other Chemical Properties

Corrosion, Ionization, Radioactive Isotopes, Solubility 0

Mechanical

Density

Density At Room Temperature

11.85 g/cm³ 31

Density When Liquid (at m.p.)

11.22 g/cm3 13

Vapor Pressure

Vapor Pressure at 1000 K

16.90 (Pa) 5

Vapor Pressure at 2000 K

Not Available 0

Tensile Strength

Not Available 0

Viscosity

Not Available 0

Elasticity properties

Shear Modulus

2.80 GPa 51

Bulk Modulus

43.00 GPa 28

Young's Modulus

8.00 GPa 54

Poisson Ratio

0.45 2

Other Mechanical Properties

Ductile, Sectile 0

Periodic Table

Symbol

Tl 0

Group Number

13 5

Period Number

6 2

Block

p block 0

Element Family

Post-Transition 0

Atomic

Atomic Number

81 35

Atomic Weight

204.38 amu 31

Atomic Volume

17.20 cm3/mol 31

Electron Configuration

[Xe] 4f¹⁴ 5d¹⁰ 6s² 6p¹ 0

Valence Electron Potential

9.60 (-eV) 64

Atom

Number of Protons

81 35

Number of Neutrons

123 20

Number of Electrons

81 35

Crystal Structure

Hexagonal Close Packed (HCP) 0

Crystal Lattice

BCC-Crystal-Structure-.jpg#100 0

Radius of an Atom

Atomic Radius

170.00 pm 22

Covalent Radius

145.00 pm 39

Van der Waals Radius

196.00 pm 30

Lattice Constant

345.66 pm 45

Lattice Angles

π/2, π/2, 2 π/3 0

Lattice C/A Ratio

1.60 6

Adjacent Atomic Numbers

Next Element

18 0

Previous Element

8 0

Magnetic

Electrical Properties

Resistivity

0.18 nΩ·m 70

Electrical Conductivity

0.06 10⁶/cm Ω 32

Electron Affinity

19.20 kJ/mol 32

Electrical Property

Conductor 0

Magnetic Characteristics

Specific Gravity

11.85 22

Magnetic Ordering

Diamagnetic 0

Permeability

Not Available 0

Susceptibility

Not Available 0

Thermal

Specific Heat

0.13 J/(kg K) 39

Thermal Conductivity

46.10 W/m·K 33

Critical Temperature

Not Available 0

Molar Heat Capacity

26.32 J/mol·K 29

Thermal Expansion

29.90 µm/(m·K) 12

Standard Molar Entropy

64.20 J/mol.K 19

Enthalpy

Enthalpy of Vaporization

162.10 kJ/mol 45

Enthalpy of Fusion

4.27 kJ/mol 54

Enthalpy of Atomization

179.90 kJ/mol 48

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