Ang kobalto (Iningles cobalt) mao ang elementong kimiko sa talaang peryodiko nga may simbolo nga Co ug kaiphan nga atomik 27. Ang kobalto mao ang puthaw nga transisyon.
Quick Facts Cobalt, Panagway ...
| Cobalt |
|---|
27Co |
|
|
| Panagway |
hard lustrous gray metal
 |
| Kinatibuk-ang mga kinaiya |
| Ngalan, simbolo, kaiphan |
cobalt, Co, 27 |
| Paglitok |
[[Help:Pronunciation respelling key|Plantilya:Smallcaps all-bolt]][1] |
| Kategoriyang elemento |
puthaw nga transisyon |
| Group, period, block |
9, 4, d |
| Gibug-aton sa atomo |
58.933195(5) |
| Kontorno sa elektron |
[Ar] 4s2 3d7
2, 8, 15, 2
 Electron shells of cobalt (2, 8, 15, 2) |
| History |
| Pagkadiskobre |
Georg Brandt (1732) |
| Physical properties |
| Color |
metallic gray |
| Phase |
magahi |
| Density (near r.t.) |
8.90 g·cm−3 |
| Liquid density at m.p. |
7.75 g·cm−3 |
| Melting point |
1768 K, 1495 °C, 2723 °F |
| Boiling point |
3200 K, 2927 °C, 5301 °F |
| Heat of fusion |
16.06 kJ·mol−1 |
| Heat of vaporization |
377 kJ·mol−1 |
| Molar heat capacity |
24.81 J·mol−1·K−1 |
| Vapor pressure |
| P (Pa) |
1 |
10 |
100 |
1 k |
10 k |
100 k |
| at T (K) |
1790 |
1960 |
2165 |
2423 |
2755 |
3198 |
|
| Atomic properties |
| Oxidation states |
5, 4, 3, 2, 1, -1[2]
(amphoteric oxide) |
| Electronegativity |
1.88 (Pauling scale) |
Ionization energies
(more) |
1st: 760.4 kJ·mol−1 |
| 2nd: 1648 kJ·mol−1 |
| 3rd: 3232 kJ·mol−1 |
| Atomic radius |
125 pm |
| Covalent radius |
126±3 (low spin), 150±7 (high spin) pm |
| Miscellanea |
| Crystal structure |
hexagonal
|
| Magnetic ordering |
ferromagnetic |
| Electrical resistivity |
(20 °C) 62.4 nΩ·m |
| Thermal conductivity |
100 W·m−1·K−1 |
| Thermal expansion |
(25 °C) 13.0 µm·m−1·K−1 |
| Speed of sound (thin rod) |
(20 °C) 4720 m·s−1 |
| Young's modulus |
209 GPa |
| Shear modulus |
75 GPa |
| Bulk modulus |
180 GPa |
| Poisson ratio |
0.31 |
| Mohs hardness |
5.0 |
| Vickers hardness |
1043 MPa |
| Brinell hardness |
700 MPa |
| CAS registry number |
7440-48-4 |
| Most stable isotopes |
| Main article: Isotopes of cobalt |
| iso |
NA |
half-life |
DM |
DE (MeV) |
DP |
|---|
| 56Co |
syn |
77.27 d |
ε |
4.566 |
56Fe |
| 57Co |
syn |
271.79 d |
ε |
0.836 |
57Fe |
| 58Co |
syn |
70.86 d |
ε |
2.307 |
58Fe |
| 59Co |
100% |
59Co is stable with 32 neutrons |
| 60Co |
syn |
5.2714 years |
β−, γ |
2.824 |
60Ni |
|
| · r |
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