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Cobaut,
27
Co
Cobaut
Pronunciation
oʊ
Appearance
haird lustrous gray metal
Standard atomic weight
r,
std
(Co)
7001589331940000000♠
58.933
194
(3)
Cobaut in the
periodic cairt
Hydrogen
Helium
Lithium
Beryllium
Boron
Carbon
Nitrogen
Oxygen
Fluorine
Neon
Sodium
Magnesium
Aluminium
Silicon
Phosphorus
Sulfur
Chlorine
Argon
Potassium
Calcium
Scandium
Titanium
Vanadium
Chromium
Manganese
Airn
Cobalt
Nickel
Capper
Zinc
Gallium
Germanium
Arsenic
Selenium
Bromine
Krypton
Rubidium
Strontium
Yttrium
Zirconium
Niobium
Molybdenum
Technetium
Ruthenium
Rhodium
Palladium
Siller (element)
Cadmium
Indium
Tin
Antimony
Tellurium
Iodine
Xenon
Caesium
Barium
Lanthanum
Cerium
Praseodymium
Neodymium
Promethium
Samarium
Europium
Gadolinium
Terbium
Dysprosium
Holmium
Erbium
Thulium
Ytterbium
Lutetium
Hafnium
Tantalum
Tungsten
Rhenium
Osmium
Iridium
Platinum
Gowd
Mercur (element)
Thallium
Leid (element)
Bismuth
Polonium
Astatine
Radon
Francium
Radium
Actinium
Thorium
Protactinium
Uranium
Neptunium
Plutonium
Americium
Curium
Berkelium
Californium
Einsteinium
Fermium
Mendelevium
Nobelium
Lawrencium
Rutherfordium
Dubnium
Seaborgium
Bohrium
Hassium
Meitnerium
Darmstadtium
Roentgenium
Copernicium
Ununtrium
Flerovium
Ununpentium
Livermorium
Ununseptium
Ununoctium
Co
Rh
iron
cobaut
nickel
Atomic nummer
27
Group
group
Period
period
Block
d-block
Element category
Transeetion metal
Electron confeeguration
Ar
3d
4s
Electrons per shell
2, 8, 15, 2
Pheesical properties
Colour
metallic gray
Phase
at
STP
solit
Meltin
pynt
1768
(1495
°C,
2723
°F)
Bylin
pynt
3200
(2927
°C,
5301
°F)
Density
(near
r.t.
8.90
g/cm
when
liquid (at
m.p.
7.75
g/cm
Heat
fusion
16.06
kJ/mol
Heat o vapourisation
377
kJ/mol
Molar heat capacity
24.81
J/(mol·K)
Vapour
pressur
(Pa)
10
100
10
100
at
(K)
1790
1960
2165
2423
2755
3198
Atomic properties
Oxidation states
−3, −1, 0, +1,
+2
+3
, +4, +5
(an
amphoteric
oxide)
Electronegativity
Pauling
scale: 1.88
Ionisation energies
more
Atomic radius
empirical:
125
pm
Covalent radius
126±3 (law spin), 150±7 (heich spin)
pm
Colour lines in a spectral range
Spectral lines
o cobaut
Ither properties
Naitural occurrence
primordial
Creestal structur
hexagonal
close-packed
(hcp)
Speed o soond
thin
rod
4720
m/s
(at
20
°C)
Thermal expansion
13.0
µm/(m·K)
(at
25
°C)
Thermal conductivity
100
W/(m·K)
Electrical resistivity
62.4 n
Ω·m
(at
20
°C)
Magnetic orderin
ferromagnetic
Young's modulus
209
GPa
Shear modulus
75
GPa
Bulk modulus
180
GPa
Poisson ratio
0.31
Mohs haurdness
5.0
Vickers haurdness
1043
MPa
Brinell haurdness
700
MPa
CAS Nummer
7440-48-4
History
Diskivery
Georg Brandt
(1732)
Main
isotopes o cobaut
Iso
tope
Abun
dance
Hauf-life
1/2
Decay mode
Pro
duct
56
Co
syn
77.27 d
56
Fe
57
Co
syn
271.79 d
57
Fe
58
Co
syn
70.86
58
Fe
59
Co
100%
stable
60
Co
syn
5.2714
60
Ni
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talk
edit
references
Cobaut
is a
chemical element
wi symbol
Co
an atomic nummer 27. Lik nickel, cobaut in the Yird's crust is foond anly in chemically combined furm, save for smaa deposits foond in alloys o naitural
meteoric iron
. The free element, produced bi reductive
smeltin
, is a haird, lustrous, siller-gray
metal
Cobaut-based blue pigments (
cobalt blue
) hae been uised syne auncient times for jewelry an pents, an tae impairt a distinctive blue tint tae gless, but the colour wis later thocht bi alchemists tae be due tae the kent metal
bismuth
. Miners haed lang uised the name
kobold
ure
(German for
goblin ure
) for some o the blue-pigment producin
minerals
; thay war sae named acause thay war puir in kent metals, an gae pushionous
arsenic
-containin fumes whan smeltit. In 1735, sic ures war foond tae be reducible tae a new metal (the first diskivert syne ancient times), an this wis ultimately named for the
kobold
The day, some cobaut is produced speceefically frae ane o a nummer o metallic-lustered ures, sic as for example
cobaltite
(Co
As
). The element is houiver mair uisually produced as a bi-product o
capper
an
nickel
minin.
The capper belt
in the
Democratic Republic o the Congo
(DRC) an
Zambie
yields maist o the global cobalt production. The DRC alane accountit for mair nor 50% o warld production in 2016 (123,000 tonnes), accordin tae
Natural Resources Canada
Cobalt is primarily uised in the manufactur o
magnetic
, wear-resistant an heich-strenth
alloys
. The compoonds cobaut silicate an
cobaut(II) aluminate
(CoAl
, cobaut blue) gie a distinctive deep blue colour tae
gless
ceramics
inks
pents
an
varnishes
. Cobaut occurs naiturally as anerly ane stable
isotope
, cobalt-59.
Cobalt-60
is a commercially important radioisotope, uised as a
radioactive tracer
an for the production o heich energy
gamma rays
Cobalt is the active centre o a group of
coenzymes
cried
cobalamins
veetamin B
12
, the best-kent example of the teep, is an essential
veetamin
for aw ainimals. Cobaut in inorganic form is an aw a
micronutrient
for
bacteria
algae
, an
fungi
References
eedit
edit soorce
Oxford English Dictionary
, 2nd Edition 1989.
Meija, Juris; et al. (2016).
"Atomic weights of the elements 2013 (IUPAC Technical Report)"
Pure and Applied Chemistry
88
(3): 265–91.
doi
10.1515/pac-2015-0305
Greenwood, Norman N.
; Earnshaw, Alan (1997).
Chemistry of the Elements
(2nd ed.).
Butterworth–Heinemann
. pp.
1117–1119.
ISBN
0080379419
Danielle Bochove (1 November 2017). "Electric car future spurs Cobalt rush: Swelling demand for product breathes new life into small Ontario town".
Vancouver Sun
. Bloomberg.
The
periodic cairt
o the elements
He
Li
Be
Ne
Na
Mg
Al
Si
Cl
Ar
Ca
Sc
Ti
Cr
Mn
Fe
Co
Ni
Cu
Zn
Ga
Ge
As
Se
Br
Kr
Rb
Sr
Zr
Nb
Mo
Tc
Ru
Rh
Pd
Ag
Cd
In
Sn
Sb
Te
Xe
Cs
Ba
La
Ce
Pr
Nd
Pm
Sm
Eu
Gd
Tb
Dy
Ho
Er
Tm
Yb
Lu
Hf
Ta
Re
Os
Ir
Pt
Au
Hg
Tl
Pb
Bi
Po
At
Rn
Fr
Ra
Ac
Th
Pa
Np
Pu
Am
Cm
Bk
Cf
Es
Fm
Md
No
Lr
Rf
Db
Sg
Bh
Hs
Mt
Ds
Rg
Cn
Nh
Fl
Mc
Lv
Ts
Og
Alkali metals
Alkaline yird metals
Lanthanides
Actinoids
Transeetion elements
Ither
metals
Metalloids
Ither
nane-metals
Halogens
Noble gases
Unkent chemical properties
Taen frae "
Categeries
Chemical elements
Dietary minerals
Transeetion metals
Cobaut
Ferromagnetic materials
IARC Group 2B carcinogens
Biology an pharmacology o chemical elements
Hidden categories:
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Cobaut
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