Write a partial decay series for Rn-220 undergoing the sequential decays: a, a, b, b.

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Identify the initial isotope: Rn-220 (Radon-220).

Understand the decay process: Alpha (α) decay reduces the atomic number by 2 and the mass number by 4.

Apply the first α decay: Rn-220 undergoes α decay to form a new element with atomic number 84 and mass number 216.

Apply the second α decay: The new element undergoes another α decay, reducing the atomic number by 2 and the mass number by 4 again.

Apply the first β decay: Beta (β) decay increases the atomic number by 1 while the mass number remains unchanged.

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Radioactive Decay

Radioactive decay is the process by which unstable atomic nuclei lose energy by emitting radiation. This can occur in various forms, including alpha (α) decay, where a helium nucleus is emitted, and beta (β) decay, where a neutron is transformed into a proton, emitting an electron. Understanding these decay processes is essential for predicting the transformation of one element into another over time.

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03:00

Rate of Radioactive Decay

Decay Series

A decay series is a sequence of radioactive decays that an unstable nucleus undergoes until it reaches a stable state. Each step in the series involves the emission of radiation and results in the formation of a new element or isotope. In the case of Rn-220, the decay series will illustrate how it transforms through multiple decay events, leading to different daughter isotopes.

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02:02

Activity Series Chart

Alpha and Beta Decay

Alpha decay involves the emission of an alpha particle (two protons and two neutrons), resulting in a decrease of the atomic number by two and the mass number by four. Beta decay, on the other hand, involves the conversion of a neutron into a proton with the emission of a beta particle (an electron), increasing the atomic number by one while the mass number remains unchanged. These processes are fundamental in constructing the decay series for Rn-220.

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