|
|
ନାମ, ପ୍ରତୀକ | chromium, Cr |
---|
Appearance | silvery metallic |
---|
ଉଚ୍ଚାରଣ | KROH-mee-əm |
---|
|
|
ପରମାଣୁ କ୍ରମାଙ୍କ (Z) | 24 |
---|
ଶ୍ରେଣୀ, ବ୍ଳକ | group 6, d-block |
---|
ପର୍ଯ୍ୟାୟ | period 4 |
---|
ମୌଳିକ ପ୍ରକାର | transition metal |
---|
ମାନକ ପରମାଣବିକ ଓଜନ (±) (Ar) | 51.9961(6) |
---|
ଇଲେକ୍ଟ୍ରୋନ୍ ବିନ୍ୟାସ | [Ar] 3d5 4s1 |
---|
per shell | 2, 8, 13, 1 |
---|
|
ଅବସ୍ଥା | solid |
---|
ଗଳନାଙ୍କ | 2180 K (1907 °C, 3465 °F) |
---|
ସ୍ଫୁଟନାଙ୍କ | 2944 K (2671 °C, 4840 °F) |
---|
Density near r.t. | 7.19 g/cm3 |
---|
when liquid, at m.p. | 6.3 g/cm3 |
---|
Heat of fusion | 21.0 kJ/mol |
---|
Heat of | 339.5 kJ/mol |
---|
Molar heat capacity | 23.35 J/(mol·K) |
---|
pressure
P (Pa)
|
1
|
10
|
100
|
1 k
|
10 k
|
100 k
|
at T (K)
|
1656
|
1807
|
1991
|
2223
|
2530
|
2942
| |
|
Oxidation states | 6, 5, 4, 3, 2, 1, -1, -2 strongly acidic oxide |
---|
Electronegativity | Pauling scale: 1.66 |
---|
energies | (more) |
---|
Atomic radius | empirical: 128 pm |
---|
Covalent radius | 139±5 pm |
---|
|
Crystal structure | body-centered cubic (bcc) |
---|
Speed of sound thin rod | 5940 m/s (at 20 °C) |
---|
Thermal expansion | 4.9 µm/(m·K) (at 25 °C) |
---|
Thermal conductivity | 93.9 W/(m·K) |
---|
Electrical resistivity | 125 n Ω·m (at 20 °C) |
---|
Magnetic ordering | AFM (rather: SDW[୧]) |
---|
Young's modulus | 279 GPa |
---|
Shear modulus | 115 GPa |
---|
Bulk modulus | 160 GPa |
---|
Poisson ratio | 0.21 |
---|
Mohs hardness | 8.5 |
---|
Vickers hardness | 1060 MPa |
---|
Brinell hardness | 1120 MPa |
---|
CAS Number | 7440-47-3 |
---|
|
ଆବିଷ୍କାର | Louis Nicolas Vauquelin (1797) |
---|
First isolation | Louis Nicolas Vauquelin (1798) |
---|
|
|
| references |