Radioactive isotopes in clastic sedimentary rocks always predict an age that is
a) older than the sedimentary rock.
b) younger than the sedimentary rock.
c) correct for the sedimentary rock.
The isotope of element X has 15 protons, 17 neutrons, and 15 electrons. The element has an atomic number of ______ and a mass number of ______.
a) 15; 32
b) 17; 15
c) 17; 47
d) 15; 30
If radioactive decay began with 400,000 parent isotopes, how many would be left after three half-lives?
a) 200,000
b) 100,000
c) 50,000
d) 25,000
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