Four radioactive decay series are known-three naturally...

Four radioactive decay series are known-three naturally occurring, and one beginning with the synthetic isotope ${ }_{94}^{241} \mathrm{Pu}$. To which of these decay series does the isotope ${ }^{219} \mathrm{Rn}$ belong? To which series does ${ }^{220} \mathrm{Rn}$ belong? Each isotope in these series decays by either alpha emission or beta emission. How do these decay processes affect the mass number?

Labs

Want to see this concept in action?

NEW

Explore this concept interactively to see how it behaves as you change inputs.

View Labs

Key Concepts

Mass Number Changes

In the context of radioactive decay, the mass number indicates the total number of protons and neutrons in the nucleus. Alpha decay reduces the mass number by 4 due to the loss of an alpha particle, while beta decay does not change the mass number because it involves only a rearrangement of nucleons.

Beta Decay

Beta decay is a transformation process in which a neutron converts into a proton (or vice versa) accompanied by the emission of a beta particle (electron or positron). Unlike alpha decay, beta decay leaves the mass number unchanged while altering the atomic number by one unit.

Radioactive Decay Series

A radioactive decay series is a sequence of radioactive decays starting from a parent isotope and proceeding through various daughter isotopes until a stable nuclide is reached. Each series is characterized by the specific sequence of decay modes (alpha or beta) and can be natural or synthetic in origin.

Alpha Decay

Alpha decay is a type of radioactive decay in which an unstable nucleus emits an alpha particle, composed of 2 protons and 2 neutrons. This process reduces the mass number of the parent nucleus by 4 and decreases the atomic number by 2, resulting in a different element.

Transcript

Please give Ace some feedback