Kobalto

Cobalt
27Co
- ↑ Co ↓ Rh Periodic table iron ← cobalt → nickel
Panagway
hard lustrous gray metal
Kinatibuk-ang mga kinaiya
Ngalan, simbolo, kaiphan	cobalt, Co, 27
Paglitok	/ˈkoʊbɒlt/ [[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
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
v t e · r

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.

1. ↑ Oxford English Dictionary, 2nd Edition 1989.
2. ↑ Plantilya:Greenwood&Earnshaw2nd