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Properties of Metals - Metallurgy
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Thallium
Atomic Number: 81
Symbol: Tl
Atomic Weight: 204.3833
Discovery: Crookes 1861
Electron Configuration: [Xe] 4f14 5d10 6s2 6p1
Element Classification:
Discovered By: Sir William Crookes
Discovery Date: 1861 (England)
Name Origin: Greek: thallos (green twig), named for a bright green line in its spectrum.
Density (g/cc): 11.85
Melting Point (°K): 576.6
Boiling Point (°K): 1730
Appearance: soft bluish-gray metal
Atomic Radius (pm): 171
Atomic Volume (cc/mol): 17.2
Covalent Radius (pm): 148
Ionic Radius: 95 (+3e) 147 (+1e)
Specific Heat (@20°C J/g mol): 0.128
Fusion Heat (kJ/mol): 4.31
Evaporation Heat (kJ/mol): 162.4
Thermal Conductivity: 46.1 J/m-sec-deg
Debye Temperature (°K): 96.00
Pauling Negativity Number: 1.62
First Ionizing Energy (kJ/mol): 588.9
Oxidation States: 3, 1
Lattice Structure: hexagonal
Lattice Constant (Å): 3.460
Lattice C/A Ratio: 1.599
Uses: infrared detectors, photomultipliers
Source: obtained as a by-product of Zn/Pb smelting
References: Los Alamos National Laboratory (2001), Crescent Chemical Company (2001), Lange's Handbook of Chemistry (1952)
Copyright © All Rights Reserved by Nigel G Wilcox · · E-Mail: ngwilcox100@gmail.com
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Elements - Alphabetical:
[A] [B] [C] [D] [E] [F] [G] [H] [I] [J] [K] [L] [M] [N] [O] [P] [Q] [R] [S] [T] [U] [V] [W] [X] [Y] [Z]
In This Group:
[T43] [T22] [T81] [T50] [T73] [T65] [T69] [T90] [T52]
Ref:T81
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