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Lead (82 Pb) has four observationally stable isotopes: 204 Pb, 206 Pb, 207 Pb, 208 Pb. Lead-204 is entirely a primordial nuclide and is not a radiogenic nuclide.The three isotopes lead-206, lead-207, and lead-208 represent the ends of three decay chains: the uranium series (or radium series), the actinium series, and the thorium series, respectively; a fourth decay chain, the neptunium series ...
Natural lead consists of four stable isotopes with mass numbers of 204, 206, 207, and 208, [38] and traces of six short-lived radioisotopes with mass numbers 209–214 inclusive. The high number of isotopes is consistent with lead's atomic number being even.
Mass number [most stable isotope] hydrogen: 1 H [1.007 84, ... lead [206.14, 207.94] 2 207.2 ...
The number of protons (Z column) and number of neutrons (N column). energy column The column labeled "energy" denotes the energy equivalent of the mass of a neutron minus the mass per nucleon of this nuclide (so all nuclides get a positive value) in MeV , formally: m n − m nuclide / A , where A = Z + N is the mass number.
Specifically, 206 Pb is formed from 238 U, 207 Pb from 235 U, and 208 Pb from 232 Th. In rocks that contain uranium and thorium, the excess amounts of the three heavier lead isotopes allows the rocks to be "dated", thus providing a time estimate for when the rock solidified and the mineral held the ratio of isotopes fixed and in place.
Lead and cadmium were found in a majority of the protein powders that were tested. There is no safe level of lead, which has been linked to developmental disorders and high blood pressure.
Enjoy a classic game of Hearts and watch out for the Queen of Spades!
2.3 carbon-15: 2.449 radium-214: 2.46 rutherfordium-259m: 2.5 francium-204m1: 2.6 radium-213: 2.74 polonium-207m3: 2.79 nobelium-256: 2.91 bismuth-193m: 3.2 rutherfordium-259: 3.2 oxygen-21: 3.42 astatine-200m2: 3.5 radium-210: 3.7 francium-205: 3.80 radon-201m: 3.8 radon-219: 3.96 rutherfordium-261m: 4 lead-185m: 4.07 rutherfordium-257m: 4.1 ...