Thallium Facts - Periodic Table of the Elements

Thallium Facts - Periodic Table of the Elements ThalliumBasic Facts Nuclear Number: 81 Image: Tl Nuclear Weight: 204.3833 Disclosure: Crookes 1861 Electron Configuration: [Xe] 4f14 5d10 6s2 6p1 Component Classification: metal Found By: Sir William Crookes Disclosure Date: 1861 (England) Name Origin: Greek: thallos (green twig), named for a splendid green line in its range. Thallium Physical Data Thickness (g/cc): 11.85 Liquefying Point (Â °K): 576.6 Breaking point (Â °K): 1730 Appearance: delicate pale blue dim metal Nuclear Radius (pm): 171 Nuclear Volume (cc/mol): 17.2 Covalent Radius (pm): 148 Ionic Radius: 95 (3e) 147 (1e) Explicit Heat (20Â °C J/g mol): 0.128 Combination Heat (kJ/mol): 4.31 Vanishing Heat (kJ/mol): 162.4 Warm Conductivity: 46.1 J/m-sec-deg Debye Temperature (Â °K): 96.00 Pauling Negativity Number: 1.62 First Ionizing Energy (kJ/mol): 588.9 Oxidation States: 3, 1 Cross section Structure: hexagonal Cross section Constant (Ã… ): 3.460 Cross section C/A Ratio: 1.599 Utilizations: infrared locators, photomultipliers Source: acquired as a side-effect of Zn/Pb purifying References: Los Alamos National Laboratory (2001), Crescent Chemical Company (2001), Langes Handbook of Chemistry (1952) Occasional Table of the Elements