Lead

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Attribution: Alchemist-hp

Animated Lead

History

Long known, mentioned in Exodus. The alchemists believed lead to be the oldest metal and associated with the planet Saturn. Native lead occurs in nature, but is rare.

Sources

Lead is obtained chiefly from galena (PbS) by a roasting process. Anglesite, cerussite, and minim are other common lead minerals.

Uses

The metal is very effective as a sound absorber, is used as a radiation shield around X-ray equipment and nuclear reactors, and is used to absorb vibration. White lead, the basic carbonate, sublimed white lead, chrome yellow, and other lead compounds are used extensively in paints, although in recent years the use of lead in paints has been drastically curtailed to eliminate or reduce health hazards.

Lead oxide is used in producing fine "crystal glass" and "flint glass" of a high index of refraction for achromatic lenses. The nitrate and the acetate are soluble salts. Lead salts such as lead arsenate have been used as insecticides, but their use in recent years has been practically eliminated in favor of less harmful organic compounds.

Forms

Natural lead is a mixture of four stable isotopes: 204Pb (1.48%), 206Pb (23.6%), 207Pb (22.6%), and 208Pb (52.3%). Lead isotopes are the end products of each of the three series of naturally occurring radioactive elements: 206Pb for the uranium series, 207Pb for the actinium series, and 208Pb for the thorium series. Twenty seven other isotopes of lead, all of which are radioactive, are recognized.

Its alloys include solder, type metal, and various antifriction metals. Great quantities of lead, both as the metal and as the dioxide, are used in storage batteries. Much metal also goes into cable covering, plumbing, ammunition, and in the manufacture of lead tetraethyl.

General Info

AtomicNumber
82
Symbol
Pb
Name
Lead

Atomic Info

Appearance
AtomicWeight
207.2(1)
Color
575961
ElectronicConfiguration
[Xe] 4f14 5d10 6s2 6p2
ElectronegativityInPauling
2.33
AtomicRadiusInPM
147
IonRadiusInPM
119 (+2)
VanDerWaalsRadiusInPM
202
IEinKJmol
716
EAinKJmol
-35
OxidationStates
-4, 2, 4
StandardState
solid
BondingType
metallic
MeltingPoint
601
BoilingPoint
2022
Density
11.34
State
Post-transition metal
DiscoveredYear
Ancient