Difference between revisions of "Bismuth"
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|image name 2 comment= | |image name 2 comment= | ||
<!-- General properties --> | <!-- General properties --> | ||
| − | |name= | + | |name=Bismuth |
|symbol=Bi | |symbol=Bi | ||
|pronounce= | |pronounce= | ||
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|pronounce comment= | |pronounce comment= | ||
|pronounce 2= | |pronounce 2= | ||
| − | |alt name= | + | |alt name=Wismuth |
|alt names= | |alt names= | ||
|allotropes= | |allotropes= | ||
| − | |appearance= | + | |appearance=Silvery solid, often with rainbow layer of bismuth oxide. |
<!-- Periodic table --> | <!-- Periodic table --> | ||
|above=[[Antimony|Sb]] | |above=[[Antimony|Sb]] | ||
| Line 43: | Line 43: | ||
|block ref= | |block ref= | ||
|block comment= | |block comment= | ||
| − | |electron configuration= | + | |electron configuration=[Xe] 4f<sup>14</sup> 5d<sup>10</sup> 6s<sup>2</sup> 6p<sup>3</sup> |
|electron configuration ref= | |electron configuration ref= | ||
|electron configuration comment= | |electron configuration comment= | ||
| − | |electrons per shell= | + | |electrons per shell=2, 8, 18, 32, 18, 5 |
|electrons per shell ref= | |electrons per shell ref= | ||
|electrons per shell comment= | |electrons per shell comment= | ||
<!-- Physical properties --> | <!-- Physical properties --> | ||
|physical properties comment= | |physical properties comment= | ||
| − | |color=Silvery,rainbow when oxidized. | + | |color=Silvery, rainbow when oxidized. |
| − | |phase= | + | |phase=Solid |
|phase ref= | |phase ref= | ||
|phase comment= | |phase comment= | ||
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|density gpcm3nrt 3 ref= | |density gpcm3nrt 3 ref= | ||
|density gpcm3nrt 3 comment= | |density gpcm3nrt 3 comment= | ||
| − | |density gpcm3mp= | + | |density gpcm3mp=10.05 |
|density gpcm3mp ref= | |density gpcm3mp ref= | ||
|density gpcm3mp comment= | |density gpcm3mp comment= | ||
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|critical point ref= | |critical point ref= | ||
|critical point comment= | |critical point comment= | ||
| − | |heat fusion= | + | |heat fusion=11.30 |
|heat fusion ref= | |heat fusion ref= | ||
|heat fusion comment= | |heat fusion comment= | ||
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|heat fusion 2 ref= | |heat fusion 2 ref= | ||
|heat fusion 2 comment= | |heat fusion 2 comment= | ||
| − | |heat vaporization= | + | |heat vaporization=179 |
|heat vaporization ref= | |heat vaporization ref= | ||
|heat vaporization comment= | |heat vaporization comment= | ||
| − | |heat capacity= | + | |heat capacity=25.52 |
|heat capacity ref= | |heat capacity ref= | ||
|heat capacity comment= | |heat capacity comment= | ||
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|heat capacity 2 ref= | |heat capacity 2 ref= | ||
|heat capacity 2 comment= | |heat capacity 2 comment= | ||
| − | |vapor pressure 1= | + | |vapor pressure 1=941 |
| − | |vapor pressure 10= | + | |vapor pressure 10=1041 |
| − | |vapor pressure 100= | + | |vapor pressure 100=1165 |
| − | |vapor pressure 1 k= | + | |vapor pressure 1 k=1325 |
| − | |vapor pressure 10 k= | + | |vapor pressure 10 k=1538 |
| − | |vapor pressure 100 k= | + | |vapor pressure 100 k=1835 |
|vapor pressure ref= | |vapor pressure ref= | ||
|vapor pressure comment= | |vapor pressure comment= | ||
| Line 137: | Line 137: | ||
<!-- Atomic properties --> | <!-- Atomic properties --> | ||
|atomic properties comment= | |atomic properties comment= | ||
| − | |oxidation states= | + | |oxidation states=5, 4, '''3''', 2, 1, −1, −2, −3 |
|oxidation states ref= | |oxidation states ref= | ||
| − | |oxidation states comment= | + | |oxidation states comment=(a mildly acidic oxide) |
| − | |electronegativity= | + | |electronegativity=2.02 |
|electronegativity ref= | |electronegativity ref= | ||
|electronegativity comment= | |electronegativity comment= | ||
| − | |ionization energy 1= | + | |ionization energy 1=703 |
|ionization energy 1 ref= | |ionization energy 1 ref= | ||
|ionization energy 1 comment= | |ionization energy 1 comment= | ||
| − | |ionization energy 2= | + | |ionization energy 2=1610 |
|ionization energy 2 ref= | |ionization energy 2 ref= | ||
|ionization energy 2 comment= | |ionization energy 2 comment= | ||
| − | |ionization energy 3= | + | |ionization energy 3=2466 |
|ionization energy 3 ref= | |ionization energy 3 ref= | ||
|ionization energy 3 comment= | |ionization energy 3 comment= | ||
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|ionization energy ref= | |ionization energy ref= | ||
|ionization energy comment= | |ionization energy comment= | ||
| − | |atomic radius= | + | |atomic radius=156 |
|atomic radius ref= | |atomic radius ref= | ||
|atomic radius comment= | |atomic radius comment= | ||
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|atomic radius calculated ref= | |atomic radius calculated ref= | ||
|atomic radius calculated comment= | |atomic radius calculated comment= | ||
| − | |covalent radius= | + | |covalent radius=148±4 |
|covalent radius ref= | |covalent radius ref= | ||
|covalent radius comment= | |covalent radius comment= | ||
| − | |Van der Waals radius= | + | |Van der Waals radius=207 |
|Van der Waals radius ref= | |Van der Waals radius ref= | ||
|Van der Waals radius comment= | |Van der Waals radius comment= | ||
<!-- Miscellanea --> | <!-- Miscellanea --> | ||
| − | |crystal structure= | + | |crystal structure= |
|crystal structure prefix= | |crystal structure prefix= | ||
|crystal structure ref= | |crystal structure ref= | ||
| − | |crystal structure comment= | + | |crystal structure comment= Rhomboedral |
|crystal structure 2= | |crystal structure 2= | ||
|crystal structure 2 prefix= | |crystal structure 2 prefix= | ||
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|speed of sound ref= | |speed of sound ref= | ||
|speed of sound comment= | |speed of sound comment= | ||
| − | |speed of sound rod at 20= | + | |speed of sound rod at 20=1790 |
|speed of sound rod at 20 ref= | |speed of sound rod at 20 ref= | ||
|speed of sound rod at 20 comment= | |speed of sound rod at 20 comment= | ||
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|thermal expansion ref= | |thermal expansion ref= | ||
|thermal expansion comment= | |thermal expansion comment= | ||
| − | |thermal expansion at 25= | + | |thermal expansion at 25=13.4 |
|thermal expansion at 25 ref= | |thermal expansion at 25 ref= | ||
|thermal expansion at 25 comment= | |thermal expansion at 25 comment= | ||
| − | |thermal conductivity= | + | |thermal conductivity=7.97 |
|thermal conductivity ref= | |thermal conductivity ref= | ||
|thermal conductivity comment= | |thermal conductivity comment= | ||
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|electrical resistivity at 0 ref= | |electrical resistivity at 0 ref= | ||
|electrical resistivity at 0 comment= | |electrical resistivity at 0 comment= | ||
| − | |electrical resistivity at 20= | + | |electrical resistivity at 20=1.29·10<sup>-6</sup> |
|electrical resistivity at 20 ref= | |electrical resistivity at 20 ref= | ||
|electrical resistivity at 20 comment= | |electrical resistivity at 20 comment= | ||
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|Curie point ref= | |Curie point ref= | ||
|Curie point comment= | |Curie point comment= | ||
| − | |magnetic ordering= | + | |magnetic ordering=Diamagnetic |
|magnetic ordering ref= | |magnetic ordering ref= | ||
|magnetic ordering comment= | |magnetic ordering comment= | ||
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|tensile strength ref= | |tensile strength ref= | ||
|tensile strength comment= | |tensile strength comment= | ||
| − | |Young's modulus= | + | |Young's modulus=32 |
|Young's modulus ref= | |Young's modulus ref= | ||
|Young's modulus comment= | |Young's modulus comment= | ||
| − | |Shear modulus= | + | |Shear modulus=12 |
|Shear modulus ref= | |Shear modulus ref= | ||
|Shear modulus comment= | |Shear modulus comment= | ||
| − | |Bulk modulus= | + | |Bulk modulus=31 |
|Bulk modulus ref= | |Bulk modulus ref= | ||
|Bulk modulus comment= | |Bulk modulus comment= | ||
| − | |Poisson ratio= | + | |Poisson ratio=0.33 |
|Poisson ratio ref= | |Poisson ratio ref= | ||
|Poisson ratio comment= | |Poisson ratio comment= | ||
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|Vickers hardness ref= | |Vickers hardness ref= | ||
|Vickers hardness comment= | |Vickers hardness comment= | ||
| − | |Brinell hardness= | + | |Brinell hardness=70–95 |
|Brinell hardness ref= | |Brinell hardness ref= | ||
|Brinell hardness comment= | |Brinell hardness comment= | ||
| − | |CAS number= | + | |CAS number=7440-69-9 |
|CAS number ref= | |CAS number ref= | ||
|CAS number comment= | |CAS number comment= | ||
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|prediction date ref= | |prediction date ref= | ||
|prediction date= | |prediction date= | ||
| − | |discovered by= | + | |discovered by=Claude François Geoffroy |
|discovery date ref= | |discovery date ref= | ||
| − | |discovery date= | + | |discovery date=1753 |
|first isolation by= | |first isolation by= | ||
|first isolation date ref= | |first isolation date ref= | ||
Revision as of 15:54, 2 October 2017
 | |||||
| General properties | |||||
|---|---|---|---|---|---|
| Name, symbol | Bismuth, Bi | ||||
| Alternative name | Wismuth | ||||
| Appearance | Silvery solid, often with rainbow layer of bismuth oxide. | ||||
| Bismuth in the periodic table | |||||
| |||||
| Atomic number | 83 | ||||
| Standard atomic weight (Ar) | 208.98040 | ||||
| Group, block | , p-block | ||||
| Period | period 6 | ||||
| Electron configuration | [Xe] 4f14 5d10 6s2 6p3 | ||||
per shell | 2, 8, 18, 32, 18, 5 | ||||
| Physical properties | |||||
| Silvery, rainbow when oxidized. | |||||
| Phase | Solid | ||||
| Melting point | 544.7 K (271.5 °C, 520.7 °F) | ||||
| Boiling point | 1837 K (1564 °C, 2847 °F) | ||||
| Density at (0 °C and 101.325 kPa) | 9.78 g/cm3 g/L | ||||
| when liquid, at | 10.05 g/cm3 | ||||
| Heat of fusion | 11.30 kJ/mol | ||||
| Heat of | 179 kJ/mol | ||||
| Molar heat capacity | 25.52 J/(mol·K) | ||||
| pressure | |||||
| Atomic properties | |||||
| Oxidation states | 5, 4, 3, 2, 1, −1, −2, −3 (a mildly acidic oxide) | ||||
| Electronegativity | Pauling scale: 2.02 | ||||
| energies |
1st: 703 kJ/mol 2nd: 1610 kJ/mol 3rd: 2466 kJ/mol | ||||
| Atomic radius | empirical: 156 pm | ||||
| Covalent radius | 148±4 pm | ||||
| Van der Waals radius | 207 pm | ||||
| Miscellanea | |||||
| Crystal structure | Rhomboedral | ||||
| Speed of sound thin rod | 1790 m/s (at 20 °C) | ||||
| Thermal expansion | 13.4 µm/(m·K) (at 25 °C) | ||||
| Thermal conductivity | 7.97 W/(m·K) | ||||
| Electrical resistivity | 1.29·10-6 Ω·m (at 20 °C) | ||||
| Magnetic ordering | Diamagnetic | ||||
| Young's modulus | 32 GPa | ||||
| Shear modulus | 12 GPa | ||||
| Bulk modulus | 31 GPa | ||||
| Poisson ratio | 0.33 | ||||
| Mohs hardness | 2.25 | ||||
| Brinell hardness | 70–95 MPa | ||||
| CAS Registry Number | 7440-69-9 | ||||
| History | |||||
| Discovery | Claude François Geoffroy (1753) | ||||
Bismuth is a chemical element with symbol Bi and atomic number 83. It is a post-transition metal, grey and dense. This metal is known to be among the least toxic heavy metals. Bismuth-209 is currently known as isotope with longest decay half-time of all radioactive elements calculated to be (1.9 +/- 0.2 ) x 1019years, which is in good agreement with the theoretical prediction of 4.6 x 1019years.[1]
Contents
Properties
Chemical
Bismuth is stable to both dry and moist air at ordinary temperatures. When red-hot, it reacts with water to make bismuth trioxide[2].
- 2 Bi + 3 H2O → Bi2O3 + 3 H2
Bismuth dissolves in concentrated sulfuric acid to make bismuth(III) sulfate and sulfur dioxide.
- 2 Bi + 6 H2SO4 → 6 H2O + Bi2(SO4)3 + 3 SO2
Bismuth reacts with halogens to produce bismuth halides. Unlike bismuth trifluoride and bismuth triiodide, bismuth trichloride and bismuth pentafluoride rapidly hydrolyse in moist air and water. Bismuth will react with most acids, but oxygen or hydrogen peroxide has to be present to oxidize the metal.
Physical
Bismuth is a brittle white-silver metal in its pure form. It will oxidize in air to form an iridescent hue, under certain circumstances, showing many colors from yellow to blue. It has the lowest thermal conductivity of all known metals and it is the most diamagnetic pure element. Small samples of bismuth metal can levitate in the presence of strong magnetic fields. Similar to antimony, gallium, germanium and silicon, bismuth is denser in the liquid phase than the solid (like ice), expanding 3.32% on solidification.
Availability
Bismuth is present as bismuth subsalicylate in Pepto-Bismol. It can be extracted from the compound, as shown here.
Large chunks of metal can be bought as Hopper crystals, that display beautiful iridescence.
Bismuth is found in certain electronics, mostly as lead-free solder. The solder that binds the ceramic lid to the CPU appears to be mostly of bismuth, as after melting it and letting it cool in open air it displays the typical iridescence.
Some gun stores advertise shotgun pellets made of bismuth or alloys thereof as "green", or non-toxic ammo, as opposed to lead pellets.
Preparation
Bismuth can be extracted from Pepto-Bismol, by adding acid and then reducing the metal with either aluminium or other reducing metal.
Projects
- Making bismuth crystals
- Levitation with magnets
Handling
Safety
Unlike it's surrounding metals (lead, antimony, polonium), bismuth and bismuth compounds have low toxicity. Overexposure to bismuth, however, can result in the formation of a black deposit on the gums, known as a "bismuth line".
Some of its compounds, such as bismuth chloride will hydrolyze in moist air and is corrosive to skin, so protection is required when handling the compound.
Bismuth is technically radioactive; its naturally occurring isotope bismuth-209 is not fully stable. But its half-life is so high and radioactivity so low that it can be considered stable for all intents and purposes. It does not pose a radioactive hazard.
Storage
Bismuth does not require special storage. Hopper crystals can be displayed on any shelf or table.
Disposal
It's best to try to recycle the bismuth and avoid dumping it in the environment.
References
- ↑ http://physicsworld.com/cws/article/news/2003/apr/23/bismuth-breaks-half-life-record-for-alpha-decay
- ↑ http://en.wikipedia.org/wiki/Bismuth
