Polonium isotopes are decay products of thorium or uranium.
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Polonium has 33 isotopes, more than any other element, of which
all are radioactive.
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209Po and 211Po are isotopes of polonium. 209Po and 211Po have
the same number of protons and electrons, also the same atomic
number; the number of protons is of course different. The two
isotopes are radioactive.
Calculate the average atomic mass of an unknown element that has two naturally-occurring isotopes The first isotope occurs 75.47 percent of the time and has a mass of 248.7 amu The second isotope occu
By referring to the periodic chart indicate which is the mass number of copper