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Chromium |
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Ìhànsójú | silvery metallic |
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Ìwúwo átọ̀mù Ar, std(Cr) | 51.9961(6)[1] |
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Chromium ní orí tábìlì àyè |
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|
Nọ́mbà átọ̀mù (Z) | 24 |
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Ẹgbẹ́ | group 6 |
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Àyè | àyè 4 |
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Àdìpọ̀ | Àdìpọ̀-d |
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Ẹ̀ka ẹ́límẹ́ntì | Transition metal |
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Ìtò ẹ̀lẹ́ktrọ́nù | [Ar] 3d5 4s1 |
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Iye ẹ̀lẹ́ktrọ́nù lórí ìpele kọ̀ọ̀kan | 2, 8, 13, 1 |
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Àwọn ohun ìní ara |
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Ìfarahàn at STP | solid |
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Ìgbà ìyọ́ | 2180 K (1907 °C, 3465 °F) |
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Ígbà ìhó | 2944 K (2671 °C, 4840 °F) |
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Kíki (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
|
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at T (K)
|
1656
|
1807
|
1991
|
2223
|
2530
|
2942
|
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|
Atomic properties |
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Oxidation states | −4, −2, −1, 0, +1, +2, +3, +4, +5, +6 Àdàkọ:Infobox element/symbol-to-oxidation-state/comment |
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Electronegativity | Pauling scale: 1.66 |
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energies | |
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Atomic radius | empirical: 128 pm |
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Covalent radius | 139±5 pm |
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Spectral lines of chromium |
Other properties |
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Natural occurrence | primordial |
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Crystal structure | (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[2]) |
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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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Main isotopes of chromium |
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Àdàkọ:Category-inline | references |