 |
|
| ନାମ, ପ୍ରତୀକ | lanthanum, La |
|---|
| Appearance | silvery white |
|---|
| ଉଚ୍ଚାରଣ | |
|---|
|
|
|
| ପରମାଣୁ କ୍ରମାଙ୍କ (Z) | 57 |
|---|
| ଶ୍ରେଣୀ, ବ୍ଳକ | group n/a, f-block |
|---|
| ପର୍ଯ୍ୟାୟ | period 6 |
|---|
| ମୌଳିକ ପ୍ରକାର | lanthanide, sometimes considered a transition metal |
|---|
| ମାନକ ପରମାଣବିକ ଓଜନ (Ar) | 138.90547 |
|---|
| ଇଲେକ୍ଟ୍ରୋନ୍ ବିନ୍ୟାସ | [Xe] 5d1 6s2 |
|---|
per shell | 2, 8, 18, 18, 9, 2 |
|---|
|
| ଅବସ୍ଥା | solid |
|---|
| ଗଳନାଙ୍କ | 1193 K (920 °C, 1688 °F) |
|---|
| ସ୍ଫୁଟନାଙ୍କ | 3737 K (3464 °C, 6267 °F) |
|---|
| Density near r.t. | 6.162 g/cm3 |
|---|
| when liquid, at m.p. | 5.94 g/cm3 |
|---|
| Heat of fusion | 6.20 kJ/mol |
|---|
| Heat of | 402.1 kJ/mol |
|---|
| Molar heat capacity | 27.11 J/(mol·K) |
|---|
pressure (extrapolated)
| P (Pa)
|
1
|
10
|
100
|
1 k
|
10 k
|
100 k
|
| at T (K)
|
2005
|
2208
|
2458
|
2772
|
3178
|
3726
| |
|
| Oxidation states | 3, 2 (strongly basic oxide) |
|---|
| Electronegativity | Pauling scale: 1.10 |
|---|
| Atomic radius | empirical: 187 pm |
|---|
| Covalent radius | 207±8 pm |
|---|
|
| Crystal structure | hexagonal |
|---|
| Speed of sound thin rod | 2475 m/s (at 20 °C) |
|---|
| Thermal expansion | (r.t.) (α, poly) 12.1 µm/(m·K) |
|---|
| Thermal conductivity | 13.4 W/(m·K) |
|---|
| Electrical resistivity | (r.t.) (α, poly) 615 n Ω·m |
|---|
| Magnetic ordering | paramagnetic[୧] |
|---|
| Young's modulus | (α form) 36.6 GPa |
|---|
| Shear modulus | (α form) 14.3 GPa |
|---|
| Bulk modulus | (α form) 27.9 GPa |
|---|
| Poisson ratio | (α form) 0.280 |
|---|
| Mohs hardness | 2.5 |
|---|
| Vickers hardness | 491 MPa |
|---|
| Brinell hardness | 363 MPa |
|---|
| CAS Number | 7439-91-0 |
|---|
|
| ଆବିଷ୍କାର | Carl Gustaf Mosander (1838) |
|---|
|
|
|
| | references |
