 |
| ସାଧାରଣ ଗୁଣ |
|---|
| ନାମ, ପ୍ରତୀକ | polonium, Po |
|---|
| Appearance | silvery |
|---|
| ଉଚ୍ଚାରଣ | /pɵˈloʊniəm/ po-LOH-nee-əm |
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| Polonium in the periodic table |
|---|
|
|
| ପରମାଣୁ କ୍ରମାଙ୍କ (Z) | 84 |
|---|
| ଶ୍ରେଣୀ, ବ୍ଳକ | group 16 (chalcogens), p-block |
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| ପର୍ଯ୍ୟାୟ | period 6 |
|---|
| ମୌଳିକ ପ୍ରକାର | post-transition metal, post-transition metal status is disputed (see article text) |
|---|
| ମାନକ ପରମାଣବିକ ଓଜନ (Ar) | (209) |
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| ଇଲେକ୍ଟ୍ରୋନ୍ ବିନ୍ୟାସ | [Xe] 6s2 4f14 5d10 6p4 |
|---|
per shell | 2, 8, 18, 32, 18, 6 |
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| ଭୌତିକ ଗୁଣ |
|---|
| ଅବସ୍ଥା | solid |
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| ଗଳନାଙ୍କ | 527 K (254 °C, 489 °F) |
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| ସ୍ଫୁଟନାଙ୍କ | 1235 K (962 °C, 1764 °F) |
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| Density near r.t. | (alpha) 9.196 g/cm3
(beta) 9.398 g/cm3 |
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| Heat of fusion | ca. 13 kJ/mol |
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| Heat of | 102.91 kJ/mol |
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| Molar heat capacity | 26.4 J/(mol·K) |
|---|
pressure
| P (Pa)
|
1
|
10
|
100
|
1 k
|
10 k
|
100 k
| | at T (K)
|
|
|
|
(846)
|
1003
|
1236
|
|
| Atomic properties |
|---|
| Oxidation states | 6, 4, 2, −2
(amphoteric oxide) |
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| Electronegativity | Pauling scale: 2.0 |
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| Atomic radius | empirical: 168 pm |
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| Covalent radius | 140±4 pm |
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| Van der Waals radius | 197 pm |
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| Miscellanea |
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| Crystal structure | cubic |
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| Thermal expansion | 23.5 µm/(m·K) (at 25 °C) |
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| Thermal conductivity | ? 20 W/(m·K) |
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| Electrical resistivity | (α) 0.40 µ Ω·m (at 0 °C) |
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| Magnetic ordering | nonmagnetic |
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| CAS Number | 7440-08-6 |
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| ଇତିହାସ |
|---|
| ଆବିଷ୍କାର | Pierre Curie and Marie Curie (1898) |
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| First isolation | Willy Marckwald (1902) |
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| Most stable isotopes of polonium |
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|
|
| | references |
