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                                    18.Half-life period oflead is:(A) 1590 years (B) 1590 days(C) Infinite(D) Zero | 
                            
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Answer»  In total, 43 lead isotopes have been synthesized, with mass numbers 178–220. Lead-205 is the most stable radioisotope, with a half-life of around 1.5×10^7years. The second-most stable is lead-202, which has a half-life of about53,000 years, longer than any of the natural trace radioisotopes Lead 210 has a relatively short half-life of22.3 years. The amount of210Pb remaining in most samples is statistically insignificant after about seven half-lives. but this is not in option !!  | 
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