Americium-241, the isotope used in smoke detectors, has a...

Americium-241, the isotope used in smoke detectors, has a half-life of 432 years, which is sufficiently long to allow for handling it in large quantities. This isotope is prepared in the laboratory by bombarding plutonium-239 with $\alpha$ particles. In this reaction, plutonium-239 absorbs two neutrons and then decays by emission of a $\beta$ particle. Write an equation for this nuclear reaction and identify the isotope formed as an intermediate between plutonium- 239 and americium-241.

Key Concepts

Nuclear Reaction Equations

Nuclear reaction equations are symbolic representations of nuclear processes where reactants transform into products while conserving both mass number and atomic number. They allow one to account for all particles involved, including emitted neutrons or charged particles, and provide a concise way to describe complex nuclear transmutation processes.

Alpha Particle Bombardment

Alpha particle bombardment refers to a reaction in which a helium nucleus (alpha particle) collides with a heavy nucleus to induce a nuclear reaction. This process can result in the addition of mass and charge to the target nucleus, facilitating the creation of new isotopes via transmutation.

Neutron Absorption and Emission

In nuclear reactions, the absorption or emission of neutrons plays an essential role in adjusting the mass number of a nucleus without changing its atomic number. Neutron absorption can increase the mass number of the nucleus, setting the stage for subsequent decay processes, while emission of neutrons helps to balance the overall reaction equation.

Beta Decay

Beta decay is a radioactive decay process in which a neutron is converted into a proton (or vice versa) with the emission of a beta particle (an electron or positron) and an antineutrino or neutrino. This process changes the atomic number of the nucleus by one unit, thereby transforming the element into its neighbor on the periodic table, while keeping the mass number constant.

Intermediate Isotope Identification

Identifying intermediate isotopes in multi-step nuclear reactions is crucial for understanding how a target nucleus is transformed into a desired product. When a nucleus absorbs particles and then undergoes a decay process, the intermediate isotope is the species formed immediately before the final decay step, providing insight into the transfer of nucleons and the overall pathway of nuclear transmutation.

Transcript

Please give Ace some feedback