Lead: the essentials

Lead is a bluish-white lustrous metal. It is very soft, highly malleable, ductile, and a relatively poor conductor of electricity. It is very resistant to corrosion but tarnishes upon exposure to air. Lead pipes bearing the insignia of Roman emperors, used as drains from the baths, are still in service. Alloys include pewter and solder. Tetraethyl lead (PbEt4) is still used in some grades of petrol (gasoline) but is being phased out on environmental grounds.

Lead isotopes are the end products of each of the three series of naturally occurring radioactive elements.

lead bar in Cluedo

Science and Ink cartoon for lead
Cartoon by Nick D Kim ([Science and Ink], used by permission).

Lead: historical information

Lead was discovered by known since ancient times in unknown at not known. Origin of name: from the Anglo-Saxon word "lead; Latin, plumbum" (the origin of the symbol Pb is the Latin word "plumbum" meaning "liquid silver".

Lead has been known for ages and is mentioned in Exodus. Alchemists believed lead to be the oldest metal and associated it with the planet Saturn. They spent a lot of time trying to "transmute" lead into gold.

Lead is one of the elements which has an alchemical symbol, shown below (alchemy is an ancient pursuit concerned with, for instance, the transformation of other metals into gold).

{{floatR}}alchemical symbol of lead{{/floatR}}

Sometime prior to the autumn of 1803, the Englishman John Dalton was able to explain the results of some of his studies by assuming that matter is composed of atoms and that all samples of any given compound consist of the same combination of these atoms. Dalton also noted that in series of compounds, the ratios of the masses of the second element that combine with a given weight of the first element can be reduced to small whole numbers (the law of multiple proportions). This was further evidence for atoms. Dalton's theory of atoms was published by Thomas Thomson in the 3rd edition of his System of Chemistry in 1807 and in a paper about strontium oxalates published in the Philosophical Transactions. Dalton published these ideas himself in the following year in the New System of Chemical Philosophy. The symbol used by Dalton for lead is shown below. [See History of Chemistry, Sir Edward Thorpe, volume 1, Watts & Co, London, 1914.]

Dalton's symbol for lead

Lead around us Read more »

Lead has no biological role. Lead affects the gut, central nervous system and causes anaemia.

Elemental lead is found in nature sparingly. Lead is present in ores such as galena (lead sulphide, PbS), anglesite (lead sulphate, PbSO4), minim (a form of lead oxide with formula Pb3O4), cerussite (lead carbonate, PbCO3) and other minerals. Galena is the most important source.

Abundances for cobalt in a number of different environments. More abundance data »
Location ppb by weight ppb by atoms Links
Universe 10 0.06 Chemical elements abundance by weight in the universe on a miniature periodic table spark table
Crustal rocks 10000 1000 Chemical elements abundance by weight in the earth's crust on a miniature periodic table spark table
Human 1700 ppb by weight 50 atoms relative to C = 1000000 Chemical elements abundance by weight in humans on a miniature periodic table spark table

Physical properties Read more »

Heat properties Read more »

Crystal structure Read more »

The solid state structure of lead is: ccp (cubic close-packed).

Lead: orbital properties Read more »

Lead atoms have 82 electrons and the shell structure is 2.8.18.32.18.4. The ground state electronic configuration of neutral Lead is [Xe].4f14.5d10.6s2.6p2 and the term symbol of Lead is 3P0.

Isolation

Isolation: there is usually little need to make lead metal in the laboratory as it is so cheap and readily available. Lead is isolated from the sulphide, PbS. The process involves burning in a restricted air flow followed by reduction of the resulting oxide PbO with carbon.

PbS + 3/2O2 → PbO + SO2

PbO + C → Pb + CO

PbO + CO → Pb + CO2

This gives lead usually contaminated with metals such as antimony, arsenic, copper, gold, silver, tin, and zinc. A fairly complex process is used to strip out these impurities.

Lead isotopes Read more »

Lead isotopes are used for medical and scientific purposes. Pb-206 and Pb-207 can both be used to produce the medical radioisotopes Bi-205 and Bi-206. Pb-204, Pb-206 and Pb-207 are used to measure lead levels in blood. Pb-208 has been used to produce neutron-rich isotopes of W and Lu. Pb-208 has also been used to study the configuration of neutron stars. Several Lead isotopes have also been used as target in the production of super heavy elements.

Table. Stables isotopes of cobalt.
Isotope Mass
/Da
Natural
abund.
(atom %)
Nuclear
spin (I)
Nuclear
magnetic
moment (μ/μN)
204Pb 203.973020 (5) 1.4 (1) 0
206Pb 205.974440 (4) 24.1 (1) 0
207Pb 206.975872 (4) 22.1 (1) 1/2 0.58219
208Pb 207.976627 (4) 52.4 (1) 0

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