ଟଙ୍ଗ୍ଷ୍ଟନ (wolfram; ଓଲ୍ଫ୍ରାମ୍ ଭାବେ ବି ଜଣା) ହେଉଛି ଏକ ରାସାୟନିକ ମୌଳିକ ଯାହାର ପ୍ରତୀକ W ଓ ପରମାଣୁ କ୍ରମାଙ୍କ ୭୪ ।
Quick facts ସାଧାରଣ ଗୁଣ, ନାମ, ପ୍ରତୀକ ...
Tungsten, 74W |
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| ନାମ, ପ୍ରତୀକ | tungsten, W |
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| Appearance | grayish white, lustrous |
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| ଉଚ୍ଚାରଣ | TUNG-stən;
WUUL-frəm |
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| ପରମାଣୁ କ୍ରମାଙ୍କ (Z) | 74 |
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| ଶ୍ରେଣୀ, ବ୍ଳକ | group 6, d-block |
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| ପର୍ଯ୍ୟାୟ | period 6 |
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| ମୌଳିକ ପ୍ରକାର | transition metal |
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| ମାନକ ପରମାଣବିକ ଓଜନ (Ar) | 183.84 |
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| ଇଲେକ୍ଟ୍ରୋନ୍ ବିନ୍ୟାସ | [Xe] 4f14 5d4 6s2[୧] |
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per shell | 2, 8, 18, 32, 12, 2 |
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| ଅବସ୍ଥା | solid |
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| ଗଳନାଙ୍କ | 3695 K (3422 °C, 6192 °F) |
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| ସ୍ଫୁଟନାଙ୍କ | 5828 K (5555 °C, 10031 °F) |
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| Density near r.t. | 19.25 g/cm3 |
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| when liquid, at m.p. | 17.6 g/cm3 |
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| Critical point | 13892 K, MPa |
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| Heat of fusion | 35.3 kJ/mol |
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| Heat of | 806.7 kJ/mol |
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| Molar heat capacity | 24.27 J/(mol·K) |
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pressure
| P (Pa) |
1 |
10 |
100 |
1 k |
10 k |
100 k |
| at T (K) |
3477 |
3773 |
4137 |
4579 |
5127 |
5823 |
|
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| Oxidation states | 6, 5, 4, 3, 2, 1, 0, −1, −2
(mildly acidic oxide) |
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| Electronegativity | Pauling scale: 2.36 |
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| Atomic radius | empirical: 139 pm |
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| Covalent radius | 162±7 pm |
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| Crystal structure | body-centered cubic (bcc) |
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| Speed of sound thin rod | (annealed) 4620 m/s (at r.t.) |
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| Thermal expansion | 4.5 µm/(m·K) (at 25 °C) |
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| Thermal conductivity | 173 W/(m·K) |
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| Electrical resistivity | 52.8 n Ω·m (at 20 °C) |
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| Magnetic ordering | paramagnetic[୨] |
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| Young's modulus | 411 GPa |
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| Shear modulus | 161 GPa |
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| Bulk modulus | 310 GPa |
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| Poisson ratio | 0.28 |
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| Mohs hardness | 7.5 |
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| Vickers hardness | 3430 MPa |
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| Brinell hardness | 2570 MPa |
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| CAS Number | 7440-33-7 |
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| ଆବିଷ୍କାର | Torbern Bergman (1781) |
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| First isolation | Juan José Elhuyar and Fausto Elhuyar (1783) |
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|
| iso |
NA |
half-life |
DM |
DE (MeV) |
DP |
| 180W |
0.12% |
1.8×1018 y |
α |
2.516 |
176Hf |
| 181W |
syn |
121.2 d |
ε |
0.188 |
181Ta |
| 182W |
26.50% |
>1.7×1020 y |
α |
1.772 |
178Hf |
| 183W |
14.31% |
>8×1019 y |
α |
1.680 |
179Hf |
| 184W |
30.64% |
>1.8×1020 y |
α |
1.123 |
180Hf |
| 185W |
syn |
75.1 d |
β− |
0.433 |
185Re |
| 186W |
28.43% |
>4.1×1018 y |
α |
1.656 |
182Hf |
| β−β− |
- |
186Os |
|
| | references |
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