Which describes radioactive decay of a substance? More of the radioactivity is lost during the first half-life than in later half-lives. More of the radioactivity is lost during the fourth half-life than in the first half-life. Isotopes are the most stable during the first half-life. Isotopes are the least stable during the later half-lives.

More of the radioactivity is lost during the first half-life than in later half-lives describes radioactive decay of a substance.Hence, Option (A) is Correct.

What is Radioactive Decay ?

Radioactive decay is the process by which an unstable atomic nucleus loses energy by radiation.

A material containing unstable nuclei is considered radioactive.

Three of the most common types of decay are alpha decay, beta decay, and gamma decay, all of which involve emitting one or more particles.

Therefore, More of the radioactivity is lost during the first half-life than in later half-lives describes radioactive decay of a substance.Hence, Option (A) is Correct.

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