Kobalto

Cobalt
27Co
- ↑ Co ↓ Rh Periodic table iron ← cobalt → nickel
Appearance
hard lustrous gray metal
General properties
Name, simbolo, kaiphan	cobalt, Co, 27
Pronunciation	Plantilya:IPAc-en Plantilya:Respell
Element category	puthaw nga transisyon
Group, period, block	9, 4, d
Standard atomic weight	58.933195(5)
Electron configuration	[Ar] 4s2 3d7 2, 8, 15, 2
History
Discovery	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 (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

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.

Galeriya sa hulagway

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