## Isotopes of lead |

main isotopes of lead ( _{82}pb)isotope decay abundance (half-life *t*_{1/2})mode product ^{202}pbsyn 5.25(28)×10 ^{4}yε ^{202}tl^{204}pb1.4% stable ^{205}pbtrace 1.73(7)×10 ^{7}yε ^{205}tl^{206}pb24.1% stable ^{207}pb22.1% stable ^{208}pb52.4% stable ^{209}pbtrace 3.253(14) h β ^{−}^{209}bi^{210}pbtrace 22.3(22) y β ^{−}^{210}bi^{211}pbtrace 36.1(2) min β ^{−}^{211}bi^{212}pbtrace 10.64(1) h β ^{−}^{212}bi^{214}pbtrace 26.8(9) min β ^{−}^{214}biisotopic abundances vary greatly by samplestandard atomic weight *a*_{r, standard}(pb)- 207.2(1)
^{[1]}

(lead _{82}pb) has four stable :isotopes ^{204}pb,^{206}pb,^{207}pb,^{208}pb. lead-204 is entirely a and is not aprimordial nuclide . the three isotopes lead-206, lead-207, and lead-208 represent the ends of threeradiogenic nuclide : thedecay chains (or radium series), theuranium series , and theactinium series , respectively; a fourth decay chain, thethorium series , terminates with theneptunium series isotopethallium ^{205}tl. the three series terminating in lead represent the decay chain products of long-lived primordial ,^{238}u , and^{235}u , respectively. however, each of them also occurs, to some extent, as primordial isotopes that were made in supernovae, rather than radiogenically as daughter products. the fixed ratio of lead-204 to the primordial amounts of the other lead isotopes may be used as the baseline to estimate the extra amounts of radiogenic lead present in rocks as a result of decay from uranium and thorium. (see^{232}th andlead-lead dating ).uranium-lead dating the longest-lived

areradioisotopes ^{205}pb with a of 17.3 million years andhalf-life ^{202}pb with a half-life of 52,500 years. a shorter-lived naturally occurring radioisotope,^{210}pb with a half-life of 22.3 years, is useful for studying the chronology of environmental samples on time scales shorter than 100 years.sedimentation ^{[2]}the relative abundances of the four stable isotopes are approximately 1.5%, 24%, 22%, and 52.5%, combining to give a

(abundance-weighted average of the stable isotopes) of 207.2(1). lead is the element with the heaviest stable isotope,standard atomic weight ^{208}pb. (the more massive , long considered to be stable, actually has a half-life of 2.01×10^{209}bi^{19}years.) a total of 43 lead isotopes are now known, including very unstable synthetic species.in its fully ionized state, the isotope

^{205}pb also becomes stable.^{[3]}- 207.2(1)
- list of isotopes
- lead-206
- lead-204, -207, and -208
- references

Isotopic abundances vary greatly by sample | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||

A_{r, standard}(Pb) | - 207.2(1)
^{[1]}
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_{82}Pb) has four stable ^{204}Pb, ^{206}Pb, ^{207}Pb, ^{208}Pb. Lead-204 is entirely a ^{205}Tl. The three series terminating in lead represent the decay chain products of long-lived primordial ^{238}U^{235}U^{232}Th

The longest-lived ^{205}Pb with a ^{202}Pb with a half-life of 52,500 years. A shorter-lived naturally occurring radioisotope, ^{210}Pb with a half-life of 22.3 years, is useful for studying the ^{[2]}

The relative abundances of the four stable isotopes are approximately 1.5%, 24%, 22%, and 52.5%, combining to give a ^{208}Pb. (The more massive ^{209}Bi^{19} years.) A total of 43 lead isotopes are now known, including very unstable synthetic species.

In its fully ionized state, the isotope ^{205}Pb also becomes stable.^{[3]}