|
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ନାମ, ପ୍ରତୀକ | praseodymium, Pr |
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Appearance | grayish white |
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ଉଚ୍ଚାରଣ | pray-zee-ə-DIM-ee-əm[୧] |
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|
|
ପରମାଣୁ କ୍ରମାଙ୍କ (Z) | 59 |
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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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|
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)
| |
|
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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|
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) |
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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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|
ଆବିଷ୍କାର | Carl Auer von Welsbach (1885) |
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|
|
| references |