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