Which describes radioactive decay of a substance? 1) more of the radioactivity is lost during the first half-life than in later half-lives. 2) more of the radioactivity is lost during the fourth half-life than in the first half-life. 3) isotopes are the most stable during the first half-life. 4) isotopes are the least stable during the later half-lives.

1) More of the radioactivity is lost during the first half-life than in later half-lives.

Explanation:

it is to be noted that an alpha particle is an helium nucleus. so it contains 2 protons 2 neutrons and has a mass number of 4. when alpha decay particles are ejected from the nucleus it gets transformed into an atom which has atomic number less than 2 and a mass number less than 4.

an equation that could represent alpha decay is radium 226 decay of alpha particle forms radon 222.

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