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ସାଧାରଣ ଗୁଣ |
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ନାମ, ପ୍ରତୀକ | polonium, Po |
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Appearance | silvery |
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ଉଚ୍ଚାରଣ | po-LOH-nee-əm |
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Polonium in the periodic table |
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ପରମାଣୁ କ୍ରମାଙ୍କ (Z) | 84 |
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ଶ୍ରେଣୀ, ବ୍ଳକ | group 16 (chalcogens), p-block |
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ପର୍ଯ୍ୟାୟ | period 6 |
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ମୌଳିକ ପ୍ରକାର | post-transition metal, post-transition metal status is disputed (see article text) |
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ମାନକ ପରମାଣବିକ ଓଜନ (Ar) | (209) |
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ଇଲେକ୍ଟ୍ରୋନ୍ ବିନ୍ୟାସ | [Xe] 6s2 4f14 5d10 6p4 |
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per shell | 2, 8, 18, 32, 18, 6 |
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ଭୌତିକ ଗୁଣ |
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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) |
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pressure
P (Pa)
|
1
|
10
|
100
|
1 k
|
10 k
|
100 k
| at T (K)
|
|
|
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(846)
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1003
|
1236
|
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Atomic properties |
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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 |
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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 |