TALIO

Introducción

Número atómico: 81
Grupo: 13 or III A
Peso atomico: 204.3833
Período: 6
Número CAS: 7440-28-0

Clasificación

chalcogen
halógeno
Gas noble
Lantanoides
Actinoides
Elemento de tierras raras
Platino Metal Group
transuranium
No hay isótopos estables
Sólido
Líquido
Gas
Sólido (Predicho)

Descripción • Usos / Función

Thallium was discovered spectroscopically in 1861 by Crookes. The element was named after the beautiful green spectral line, which identifiedthe element. The metal was isolated both by Crookes and Lamy in 1862 about the same time. Thallium occurs in crooksite, lorandite, and hutchinsonite.It is also present in pyrites and is recovered from the roasting of this ore in connection with the production of sulfuric acid. It is also obtained fromthe smelting of lead and zinc ores. Extraction is somewhat complex and depends on the source of the thallium. Manganese nodules, found on the oceanfloor, contain thallium. When freshly exposed to air, thallium exhibits a metallic luster, but soon develops a bluish-gray tinge, resembling lead inappearance. A heavy oxide builds up on thallium if left in air, and in the presence of water the hydroxide is formed. The metal is very soft and malleable.It can be cut with a knife. forty seven isotopic forms of thallium, with atomic masses ranging from 179 to 210 are recognized. Natural thallium is amixture of two isotopes. The element and its compounds are toxic and should be handled carefully. Contact of the metal with skin is dangerous, andwhen melting the metal adequate ventilation should be provided. Thallium is suspected of carcinogenic potential for man. Thallium sulfate has beenwidely employed as a rodenticide and ant killer. It is odorless and tasteless, giving no warning of its presence. Its use, however, has been prohibitedin the U.S. since 1975 as a household insecticide and rodenticide. The electrical conductivity of thallium sulfide changes with exposure to infraredlight, and this compound is used in photocells. Thallium bromide-iodide crystals have been used as infrared optical materials. Thallium has been used,with sulfur or selenium and arsenic, to produce low melting glasses which become fluid between 125 and 150°C. These glasses have properties at roomtemperatures similar to ordinary glasses and are said to be durable and insoluble in water. Thallium oxide has been used to produce glasses with a highindex of refraction. Thallium has been used in treating ringworm and other skin infections; however, its use has been limited because of the narrowmargin between toxicity and therapeutic benefits. A mercury-thallium alloy, which forms a eutectic at 8.5% thallium, is reported to freeze at –60°C,some 20° below the freezing point of mercury. Thallium metal (99.999%) costs about $1/g. 1

• "has no practical uses as a free metal." 2

Propiedades físicas

Punto de fusion:3*  304 °C = 577.15 K = 579.2 °F
Punto de ebullición:3* 1473 °C = 1746.15 K = 2683.4 °F
Punto de sublimación:3 
Triple punto:3 
Punto crítico:3 
Densidad:4  11.8 g/cm3

* - at 1 atm

Configuración electronica

Configuración electronica: [Xe] 6s2 4f14 5d10 6p1
Bloquear: p
Ocupado más alto nivel de energía: 6
Electrones de valencia: 3

Números cuánticos:

n = 6
ℓ = 1
m = -1
ms = +½

Vinculación

electronegatividad (escala de Pauling):5 1.8
Electropositivity (escala de Pauling): 2.2
Afinidad electronica:6 0.2 eV
estados de oxidación: +1,3
Función del trabajo:7 4.02 eV = 6.44004E-19 J

potencial de ionización   eV 8  kJ/mol  
1 6.1082    589.4
potencial de ionización   eV 8  kJ/mol  
2 20.428    1971.0
potencial de ionización   eV 8  kJ/mol  
3 29.83    2878.2

termoquímica

Calor especifico: 0.129 J/g°C 9 = 26.365 J/mol°C = 0.031 cal/g°C = 6.301 cal/mol°C
Conductividad térmica: 46.1 (W/m)/K, 27°C 10
Calor de fusión: 4.142 kJ/mol 11 = 20.3 J/g
Calor de vaporización: 164.1 kJ/mol 12 = 802.9 J/g
Estado de la materia Entalpía de formación (ΔHf°)13 entropía (S°)13 Energía libre de Gibbs (ΔGf°)13
(kcal/mol) (kJ/mol) (cal/K) (J/K) (kcal/mol) (kJ/mol)
(s) 0 0 15.34 64.18256 0 0
(g) 43.55 182.2132 43.225 180.8534 35.24 147.44416

isótopos

nucleido Masa 14 Media vida 14 spin nuclear 14 Energía de unión
176Tl 176.00059(21)# 5.2(+30-14) ms (3-,4-,5-) 1,357.18 MeV
177Tl 176.996427(27) 18(5) ms (1/2+) 1,374.57 MeV
178Tl 177.99490(12)# 255(10) ms 1,382.64 MeV
179Tl 178.99109(5) 270(30) ms (1/2+) 1,390.71 MeV
180Tl 179.98991(13)# 1.5(2) s 1,408.09 MeV
181Tl 180.986257(10) 3.2(3) s 1/2+# 1,416.17 MeV
182Tl 181.98567(8) 2.0(3) s 2-# 1,424.24 MeV
183Tl 182.982193(10) 6.9(7) s 1/2+# 1,432.31 MeV
184Tl 183.98187(5) 9.7(6) s 2-# 1,440.38 MeV
185Tl 184.97879(6) 19.5(5) s 1/2+# 1,457.77 MeV
186Tl 185.97833(20) 40# s (2-) 1,465.84 MeV
187Tl 186.975906(9) ~51 s (1/2+) 1,473.91 MeV
188Tl 187.97601(4) 71(2) s (2-) 1,481.98 MeV
189Tl 188.973588(12) 2.3(2) min (1/2+) 1,490.05 MeV
190Tl 189.97388(5) 2.6(3) min 2(-) 1,498.12 MeV
191Tl 190.971786(8) 20# min (1/2+) 1,506.19 MeV
192Tl 191.97223(3) 9.6(4) min (2-) 1,514.27 MeV
193Tl 192.97067(12) 21.6(8) min 1/2(+#) 1,522.34 MeV
194Tl 193.97120(15) 33.0(5) min 2- 1,530.41 MeV
195Tl 194.969774(15) 1.16(5) h 1/2+ 1,547.79 MeV
196Tl 195.970481(13) 1.84(3) h 2- 1,546.55 MeV
197Tl 196.969575(18) 2.84(4) h 1/2+ 1,563.94 MeV
198Tl 197.97048(9) 5.3(5) h 2- 1,562.69 MeV
199Tl 198.96988(3) 7.42(8) h 1/2+ 1,580.08 MeV
200Tl 199.970963(6) 26.1(1) h 2- 1,578.84 MeV
201Tl 200.970819(16) 72.912(17) h 1/2+ 1,586.91 MeV
202Tl 201.972106(16) 12.23(2) d 2- 1,594.98 MeV
203Tl 202.9723442(14) ESTABLE 1/2+ 1,603.05 MeV
204Tl 203.9738635(13) 3.78(2) a 2- 1,611.12 MeV
205Tl 204.9744275(14) ESTABLE 1/2+ 1,619.19 MeV
206Tl 205.9761103(15) 4.200(17) min 0- 1,627.26 MeV
207Tl 206.977419(6) 4.77(2) min 1/2+ 1,635.34 MeV
208Tl 207.9820187(21) 3.053(4) min 5(+) 1,634.09 MeV
209Tl 208.985359(8) 2.161(7) min (1/2+) 1,642.16 MeV
210Tl 209.990074(12) 1.30(3) min (5+)# 1,640.92 MeV
211Tl 210.99348(22)# 1# min [>300 ns] 1/2+# 1,648.99 MeV
212Tl 211.99823(32)# 30# s [>300 ns] 5+# 1,657.06 MeV
Los valores marcados con # no son puramente derivan de los datos experimentales, pero al menos en parte, de las tendencias sistemáticas. Hace girar con débiles argumentos de asignación se incluyen entre paréntesis. 14

Abundancia

Tierra - Los compuestos de origen: sulfides 15
Tierra - Agua de mar: 0.000019 mg/L 16
Tierra -  Corteza:  0.85 mg/kg = 0.000085% 16
Tierra -  Total:  3.86 ppb 17
Planeta mercurio) -  Total:  0.044 ppb 17
Venus -  Total:  4.05 ppb 17
condritas - Total: 0.001 (relative to 106 atoms of Si) 18

Compuestos

Información de seguridad


Ficha de datos de seguridad de materiales - ACI Alloys, Inc.

Para más información

Enlaces externos:

Fuentes

(1) - Lide, David R. CRC Handbook of Chemistry and Physics, 83rd ed.; CRC Press: Boca Raton, FL, 2002; p 4:31.
(2) - Whitten, Kenneth W., Davis, Raymond E., and Peck, M. Larry. General Chemistry 6th ed.; Saunders College Publishing: Orlando, FL, 2000; p 933.
(3) - Lide, David R. CRC Handbook of Chemistry and Physics, 83rd ed.; CRC Press: Boca Raton, FL, 2002; p 4:132.
(4) - Lide, David R. CRC Handbook of Chemistry and Physics, 84th ed.; CRC Press: Boca Raton, FL, 2002; p 4:39-4:96.
(5) - Dean, John A. Lange's Handbook of Chemistry, 11th ed.; McGraw-Hill Book Company: New York, NY, 1973; p 4:8-4:149.
(6) - Lide, David R. CRC Handbook of Chemistry and Physics, 84th ed.; CRC Press: Boca Raton, FL, 2002; p 10:147-10:148.
(7) - Speight, James. Lange's Handbook of Chemistry, 16th ed.; McGraw-Hill Professional: Boston, MA, 2004; p 1:132.
(8) - Lide, David R. CRC Handbook of Chemistry and Physics, 83rd ed.; CRC Press: Boca Raton, FL, 2002; p 10:178 - 10:180.
(9) - Lide, David R. CRC Handbook of Chemistry and Physics, 83rd ed.; CRC Press: Boca Raton, FL, 2002; p 4:133.
(10) - Lide, David R. CRC Handbook of Chemistry and Physics, 83rd ed.; CRC Press: Boca Raton, FL, 2002; pp 6:193, 12:219-220.
(11) - Lide, David R. CRC Handbook of Chemistry and Physics, 83rd ed.; CRC Press: Boca Raton, FL, 2002; pp 6:123-6:137.
(12) - Lide, David R. CRC Handbook of Chemistry and Physics, 83rd ed.; CRC Press: Boca Raton, FL, 2002; pp 6:107-6:122.
(13) - Dean, John A. Lange's Handbook of Chemistry, 12th ed.; McGraw-Hill Book Company: New York, NY, 1979; p 9:4-9:94.
(14) - Atomic Mass Data Center. http://amdc.in2p3.fr/web/nubase_en.html (accessed July 14, 2009).
(15) - Silberberg, Martin S. Chemistry: The Molecular Nature of Matter and Change, 4th ed.; McGraw-Hill Higher Education: Boston, MA, 2006, p 965.
(16) - Lide, David R. CRC Handbook of Chemistry and Physics, 83rd ed.; CRC Press: Boca Raton, FL, 2002; p 14:17.
(17) - Morgan, John W. and Anders, Edward, Proc. Natl. Acad. Sci. USA 77, 6973-6977 (1980)
(18) - Brownlow, Arthur. Geochemistry; Prentice-Hall, Inc.: Englewood Cliffs, NJ, 1979, pp 15-16.