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Transcript
Uranium-238 Decay Series Uranium, a radioactive element, decays to the stable element lead-206 by emitting alpha particle or beta particles. Use the periodic table to dentify the elements by the number of proton in the nucleus. Remember the atomic mass is the sum of protons and neutrons. Complete the following chart by following these rules 1. Alpha emission- expel a positive alpha particle (2p+2N): lose two protons and two neutrons. The atomic number drops by two, but the mass drops by 4. 2. Beta emissions (β or an electron) - expel a negative beta particle caused by the conversion of a neutron to a proton +β particle: gain one proton, lose one neutron, overall mass stays the same. 3. Half-life abbreviations s=seconds m=minutes d=days y=years Element Uranium Atomic Mass 238 234 Type of Radiation Radiation Emitted Alpha particle Beta particle #Protons #Neutrons Half-Life 92 -2 90 146 -2 144 4.5 x 109y 1.17m Beta particle 2.5 X 105y Alpha particle 8.0 X 104y Alpha particle Radon (gas) 222 Seeps into air from the ground 1,620y Alpha particle 3.82d Alpha particle 3.05m Alpha particle 26.8m Beta particle 19.7m Beta particle 1.6 x 10-4s Alpha particle 19.4y Beta particle 5.0d Beta particle Lead 206 Alpha particle Stable Atom 24.1d 138d 82 124 Stable Note: Lead 206 is stable and not radioactive. You have reached the end of the line!