 |
| ସାଧାରଣ ଗୁଣ |
|---|
| ନାମ, ପ୍ରତୀକ | praseodymium, Pr |
|---|
| Appearance | grayish white |
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| ଉଚ୍ଚାରଣ |
pray-zee-ə-DIM-ee-əm[୧] |
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| Praseodymium in the periodic table |
|---|
|
|
| ପରମାଣୁ କ୍ରମାଙ୍କ (Z) | 59 |
|---|
| ଶ୍ରେଣୀ, ବ୍ଳକ | group n/a, f-block |
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| ପର୍ଯ୍ୟାୟ | period 6 |
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| ମୌଳିକ ପ୍ରକାର | lanthanide |
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| ମାନକ ପରମାଣବିକ ଓଜନ (Ar) | 140.90765 |
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| ଇଲେକ୍ଟ୍ରୋନ୍ ବିନ୍ୟାସ | [Xe] 4f3 6s2 |
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per shell | 2, 8, 18, 21, 8, 2 |
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| ଭୌତିକ ଗୁଣ |
|---|
| ଅବସ୍ଥା | solid |
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| ଗଳନାଙ୍କ | 1208 K (935 °C, 1715 °F) |
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| ସ୍ଫୁଟନାଙ୍କ | 3793 K (3520 °C, 6368 °F) |
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| Density near r.t. | 6.77 g/cm3 |
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| when liquid, at m.p. | 6.50 g/cm3 |
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| Heat of fusion | 6.89 kJ/mol |
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| Heat of | 331 kJ/mol |
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| Molar heat capacity | 27.20 J/(mol·K) |
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pressure
| P (Pa)
|
1
|
10
|
100
|
1 k
|
10 k
|
100 k
| | at T (K)
|
1771
|
1973
|
(2227)
|
(2571)
|
(3054)
|
(3779)
|
|
| Atomic properties |
|---|
| Oxidation states | 4, 3, 2 (mildly basic oxide) |
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| Electronegativity | Pauling scale: 1.13 |
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| Atomic radius | empirical: 182 pm |
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| Covalent radius | 203±7 pm |
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| Miscellanea |
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| Crystal structure | hexagonal |
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| Speed of sound thin rod | 2280 m/s (at 20 °C) |
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| Thermal expansion | (r.t.) (α, poly) 6.7 µm/(m·K) |
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| Thermal conductivity | 12.5 W/(m·K) |
|---|
| Electrical resistivity | (r.t.) (α, poly)
0.700 µ Ω·m |
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| Magnetic ordering | paramagnetic[୨] |
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| Young's modulus | (α form) 37.3 GPa |
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| Shear modulus | (α form) 14.8 GPa |
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| Bulk modulus | (α form) 28.8 GPa |
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| Poisson ratio | (α form) 0.281 |
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| Vickers hardness | 400 MPa |
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| Brinell hardness | 481 MPa |
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| CAS Number | 7440-10-0 |
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| ଇତିହାସ |
|---|
| ଆବିଷ୍କାର | Carl Auer von Welsbach (1885) |
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| Most stable isotopes of praseodymium |
|---|
|
|
| | references |
