Cadmium

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Attribution: Alchemist-hp

Animated Cadmium

History

From the Latin word cadmia, Greek kadmeia - the ancient name for calamine, zinc carbonate. Discovered by Stromeyer in 1817 from an impurity in zinc carbonate. Cadmium most often occurs in small quantities associated with zinc ores, such as sphalerite (ZnS). Greenockite (CdS) is the only mineral of any consequence bearing cadmium. Almost all cadmium is obtained as a by-product in the treatment of zinc, copper, and lead ores. It is a soft, bluish-white metal which is easily cut with a knife. It is similar in many respects to zinc. In 1927 the International Conference on Weights and Measures redefined the meter in terms of the wavelength of the red cadmium spectral line (i.e. 1m = 1.553,164.13 wavelengths). This definition has been changed (see Krypton).

Uses

Cadmium is a component of some of the lowest melting alloys; it is used in bearing alloys with low coefficients of friction and great resistance to fatigue; it is used extensively in electroplating, which accounts for about 60% of its use. It is also used in many types of solder, for standard E.M.F. cells, for Ni-Cd batteries, and as a barrier to control nuclear fission. Cadmium compounds are used in black and white television phosphors and in blue and green phosphors for color TV tubes. It forms a number of salts, of which the sulfate is most common; the sulfide is used as a yellow pigment. Cadmium and solutions of its compounds are toxic.

General Info

AtomicNumber
48
Symbol
Cd
Name
Cadmium

Atomic Info

Appearance
AtomicWeight
112.411(8)
Color
FFD98F
ElectronicConfiguration
[Kr] 4d10 5s2
ElectronegativityInPauling
1.69
AtomicRadiusInPM
148
IonRadiusInPM
95 (+2)
VanDerWaalsRadiusInPM
158
IEinKJmol
868
EAinKJmol
0
OxidationStates
2
StandardState
solid
BondingType
metallic
MeltingPoint
594
BoilingPoint
1040
Density
8.65
State
Transition metal
DiscoveredYear
1817