କ୍ରୋମିୟମ ହେଉଛି ଏକ ରାସାୟନିକ ମୌଳିକ ଯାହାର ପ୍ରତୀକ Cr ଓ ପରମାଣୁ କ୍ରମାଙ୍କ ୨୪ ।
Quick facts ସାଧାରଣ ଗୁଣ, ନାମ, ପ୍ରତୀକ ...
Chromium, 24Cr |
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| ନାମ, ପ୍ରତୀକ | chromium, Cr |
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| Appearance | silvery metallic |
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| ଉଚ୍ଚାରଣ | KROH-mee-əm |
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| ପରମାଣୁ କ୍ରମାଙ୍କ (Z) | 24 |
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| ଶ୍ରେଣୀ, ବ୍ଳକ | group 6, d-block |
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| ପର୍ଯ୍ୟାୟ | period 4 |
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| ମୌଳିକ ପ୍ରକାର | transition metal |
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| ମାନକ ପରମାଣବିକ ଓଜନ (±) (Ar) | 51.9961(6) |
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| ଇଲେକ୍ଟ୍ରୋନ୍ ବିନ୍ୟାସ | [Ar] 3d5 4s1 |
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per shell | 2, 8, 13, 1 |
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| ଅବସ୍ଥା | solid |
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| ଗଳନାଙ୍କ | 2180 K (1907 °C, 3465 °F) |
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| ସ୍ଫୁଟନାଙ୍କ | 2944 K (2671 °C, 4840 °F) |
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| Density near r.t. | 7.19 g/cm3 |
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| when liquid, at m.p. | 6.3 g/cm3 |
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| Heat of fusion | 21.0 kJ/mol |
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| Heat of | 339.5 kJ/mol |
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| Molar heat capacity | 23.35 J/(mol·K) |
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pressure
| P (Pa) |
1 |
10 |
100 |
1 k |
10 k |
100 k |
| at T (K) |
1656 |
1807 |
1991 |
2223 |
2530 |
2942 |
|
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| Oxidation states | 6, 5, 4, 3, 2, 1, -1, -2 strongly acidic oxide |
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| Electronegativity | Pauling scale: 1.66 |
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| energies |
(more) |
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| Atomic radius | empirical: 128 pm |
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| Covalent radius | 139±5 pm |
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| Crystal structure | body-centered cubic (bcc) |
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| Speed of sound thin rod | 5940 m/s (at 20 °C) |
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| Thermal expansion | 4.9 µm/(m·K) (at 25 °C) |
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| Thermal conductivity | 93.9 W/(m·K) |
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| Electrical resistivity | 125 n Ω·m (at 20 °C) |
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| Magnetic ordering | AFM (rather: SDW[୧]) |
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| Young's modulus | 279 GPa |
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| Shear modulus | 115 GPa |
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| Bulk modulus | 160 GPa |
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| Poisson ratio | 0.21 |
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| Mohs hardness | 8.5 |
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| Vickers hardness | 1060 MPa |
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| Brinell hardness | 1120 MPa |
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| CAS Number | 7440-47-3 |
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| ଆବିଷ୍କାର | Louis Nicolas Vauquelin (1797) |
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| First isolation | Louis Nicolas Vauquelin (1798) |
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|
| iso |
NA |
half-life |
DM |
DE (MeV) |
DP |
| 50Cr |
4.345% |
>1.3×1018 y |
β+β+ |
1.167 |
50Ti |
| 51Cr |
syn |
27.7025 d |
ε |
- |
51V |
| γ |
0.320 |
- |
| 52Cr |
83.789% |
52Cr is stable with 28 neutrons |
| 53Cr |
9.501% |
53Cr is stable with 29 neutrons |
| 54Cr |
2.365% |
54Cr is stable with 30 neutrons |
|
| | references |
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