Chemistry

Boston

4 October, 15:21

Click in the answer box to activate the palette. was present when Earth formed, but it decayed over time. The first three steps in this decay are emission of an α particle, a β - particle, and another α particle. What is the final isotope that forms after these three decay steps? Use the isotope tool on the answer palette to enter the symbol of the isotope, including both the mass number, the atomic number, and element symbol.