Cobalt

From Conservapedia
Cobalt
Properties
Atomic symbol Co
Atomic number 27
Classification Transition metal
Atomic mass 58.9 amu
Other Information
Date of discovery 1737
Name of discoverer George Brandt
Name origin From the German kobold.
Uses In magnets, medical radio-isotopes and (as a compound) blue or green pigment in ceramics and glasses.
Obtained from Cobaltine, erythrite, glaucodot, and skutterudite.

Cobalt (KO-bolt) is a lustrous, silvery-blue metal which is magnetic.[1]

Contents

  • 1 Properties
  • 2 History
  • 3 Uses
  • 4 References

Properties[edit]

Melting Point: 2723 °F (1495 °C or 1768 K)

Boiling Point: 5301 °F (2927 °C or 3200 K)

Density: 8.86 grams per cubic centimeter

State of matter at Room Temperature: Solid[2]

Cobalt is a hard, brittle metal, which is similar in appearance to iron and nickel.[3]

History[edit]

The tomb of Pharaoh Tutankhamen, who ruled from 1361-1352 BC, contained a small glass object colored deep blue with cobalt. Cobalt blue was known even earlier in China and was used for pottery glazes.[4] Modern cobalt was officially discovered by a Swedish chemist named Georg Brandt, in 1739.[5]

Uses[edit]

Cobalt is used in several alloys, including Alnico. These alloys are used in things like jet turbines and gas turbine generators. Cobalt salts have been used for centuries to give pottery and other items a blue color. Radioactive cobalt-60 is also useful to treat cancer and in some countries, to irradiate food for preservation.[6]

References[edit]

  1. ↑ http://www.rsc.org/periodic-table/element/27/cobalt
  2. ↑ http://education.jlab.org/itselemental/ele027.html
  3. ↑ http://chemistry.about.com/od/elementfacts/a/cobalt.htm
  4. ↑ http://www.rsc.org/periodic-table/element/27/cobalt
  5. ↑ http://education.jlab.org/itselemental/ele027.html
  6. ↑ http://www.rsc.org/periodic-table/element/27/cobalt
Periodic Table of the Elements
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
1
H
1.008
2
He
4.003
3
Li
6.939
4
Be
9.0122
5
B
10.811
6
C
12.011
7
N
14.007
8
O
15.999
9
F
18.998
10
Ne
10.183
11
Na
22.99
12
Mg
24.312
13
Al
26.982
14
Si
28.086
15
P
30.974
16
S
32.064
17
Cl
35.453
18
Ar
39.948
19
K
39.102
20
Ca
40.08
21
Sc
44.956
22
Ti
47.9
23
V
50.942
24
Cr
51.996
25
Mn
54.938
26
Fe
55.847
27
Co
58.933
28
Ni
58.71
29
Cu
63.546
30
Zn
65.37
31
Ga
69.72
32
Ge
72.59
33
As
74.922
34
Se
78.96
35
Br
79.904
36
Kr
83.8
37
Rb
85.47
38
Sr
87.62
39
Y
88.905
40
Zr
91.22
41
Nb
92.906
42
Mo
95.94
43
Tc
[97]
44
Ru
101.07
45
Rh
102.91
46
Pd
106.4
47
Ag
107.87
48
Cd
112.4
49
In
114.82
50
Sn
118.69
51
Sb
121.75
52
Te
127.6
53
I
126.9
54
Xe
131.3
55
Cs
132.91
56
Ba
137.34
57*
La
138.91
72
Hf
178.49
73
Ta
180.95
74
W
183.85
75
Re
186.2
76
Os
190.2
77
Ir
192.2
78
Pt
195.09
79
Au
196.97
80
Hg
200.59
81
Tl
204.37
82
Pb
207.19
83
Bi
208.98
84
Po
210
85
At
210
86
Rn
222
87
Fr
215
88
Ra
226.03
89**
Ac
227.03
104
Rf
[261]
105
Db
[262]
106
Sg
[266]
107
Bh
[264]
108
Hs
[265]
109
Mt
[268]
110
Dt
[271]
111
Rg
[272]
112
Cn
[277]
113
Nh
[284]
114
Fv
[289]
115
Mc
[288]
116
Lv
[292]
117
Ts
[293]
118
Og
[294]
 
*Lanthanides
58
Ce
140.12
59
Pr
140.91
60
Nd
144.24
61
Pm
145
62
Sm
150.35
63
Eu
151.96
64
Gd
157.25
65
Tb
158.92
66
Dy
162.5
67
Ho
164.93
68
Er
167.26
69
Tm
168.93
70
Yb
173.04
71
Lu
174.97
 
**Actinides
90
Th
232.04
91
Pa
231
92
U
238.03
93
Np
237.05
94
Pu
239.05
95
Am
241.06
96
Cm
244.06
97
Bk
249.08
98
Cf
252.08
99
Es
252.08
100
Fm
257.1
101
Md
258.1
102
No
259.1
103
Lr
262.11
 

Categories: [Metals]

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