Cobalt, 27Co| File:Kobalt electrolytic and 1cm3 cube.jpg |
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| उच्चारण | [1] |
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| दिखावट | hard lustrous bluish gray metal |
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| Standard atomic weight Ar°(Co) | - 58.933194±0.000003
- 58.933±0.001 (abridged)[2]
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| Atomic number (Z) | 27 |
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| समूह | group 9 |
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| अवधि | period 4 |
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| ब्लॉक | d-block |
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| ऋणावेशित सूक्ष्म अणु का विन्यास | [Ar] 3d7 4s2 |
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| प्रति शेल इलेक्ट्रॉन | 2, 8, 15, 2 |
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| Phase at STP | solid |
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| गलनांक | 1768 K (1495 °C, 2723 °F) |
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| क्वथनांक | 3200 K (2927 °C, 5301 °F) |
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| Density (near r.t.) | 8.90 g/cm3 |
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| when liquid (at m.p.) | 8.86 g/cm3 |
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| संलयन की गर्मी | 16.06 kJ/mol |
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| Heat of vaporization | 377 kJ/mol |
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| दाढ़ गर्मी क्षमता | 24.81 J/(mol·K) |
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Vapor pressure
| P (Pa)
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1
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10
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100
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1 k
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10 k
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100 k
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| at T (K)
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1790
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1960
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2165
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2423
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2755
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3198
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| ऑक्सीकरण राज्य | −3, −1, 0, +1, +2, +3, +4, +5[3] (an amphoteric oxide) |
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| इलेक्ट्रोनगेटिविटी | Pauling scale: 1.88 |
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| Ionization energies | - 1st: 760.4 kJ/mol
- 2nd: 1648 kJ/mol
- 3rd: 3232 kJ/mol
- (more)
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| परमाणु का आधा घेरा | empirical: 125 pm |
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| सहसंयोजक त्रिज्या | Low spin: 126±3 pm High spin: 150±7 pm |
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| Spectral lines of cobalt |
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| प्राकृतिक घटना | primordial |
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| क्रिस्टल की संरचना | hexagonal close-packed (hcp) |
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| Speed of sound thin rod | 4720 m/s (at 20 °C) |
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| थर्मल विस्तार | 13.0 µm/(m⋅K) (at 25 °C) |
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| ऊष्मीय चालकता | 100 W/(m⋅K) |
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| विद्युत प्रतिरोधकता | 62.4 nΩ⋅m (at 20 °C) |
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| चुंबकीय आदेश | ferromagnetic |
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| यंग मापांक | 209 GPa |
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| कतरनी मापांक | 75 GPa |
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| थोक मापांक | 180 GPa |
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| पॉइसन अनुपात | 0.31 |
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| मोहन कठोरता | 5.0 |
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| विकर्स कठोरता | 1043 MPa |
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| ब्रिनेल हार्डनेस | 470–3000 MPa |
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| CAS नंबर | 7440-48-4 |
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| खोज और पहला अलगाव | Georg Brandt (1735) |
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Category Category: Cobalt | references |
Co: Script error: The module returned a nil value. It is supposed to return an export table.
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in
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calc from C
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diff
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report
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ref
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| C
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1495
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—
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—
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| K
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1768
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1768
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0
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| F
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2723
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2723
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0
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| max precision
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0
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| WD
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Script error: The module returned a nil value. It is supposed to return an export table.
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Script error: The module returned a nil value. It is supposed to return an export table.
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| input
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C: 1495, K: 1768, F: 2723
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| comment
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Co: Script error: The module returned a nil value. It is supposed to return an export table.
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|
in
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calc from C
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diff
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report
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ref
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| C
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2927
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—
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—
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| K
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3200
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3200
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0
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| F
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5301
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5301
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0
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| max precision
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0
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| WD
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Script error: The module returned a nil value. It is supposed to return an export table.
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Script error: The module returned a nil value. It is supposed to return an export table.
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| input
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C: 2927, K: 3200, F: 5301
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| comment
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References
These references will appear in the article, but this list appears only on this page.
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