The isotope Beryllium-10 decays to Boron-10 over a half-life of 1.5 million years. These isotopes would have experienced four half lives in igneous rocks that were 6 million years old. Select one: True False

Number of half lives experienced by an isotope was 4,so the given statement is true.

Explanation:

The initial amount of isotope Beryllium-10  = [A_o][/tex]

Final amount of isotope Beryllium-10 after time t = [A]

t = 6 million years

Half life of the sample = = 1.5 million years

Decay constant of the process =

Integrated law of first order reaction:

Number of half lives elapsed be n:

       ............(1)

Solving fro n:

n = 3.999 ≈ 4

Number of half lives experienced by an isotope was 4,so the given statement is true.

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it's c. elements are placed in rows based on how may valencies electrons have.