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3.
Of the three isotopes of carbon, which is most abundant and which is radioactive?
C-12 & C-13
C-13 & C-14
C-14 & C-12
C-12 & C-14
no way to know
4.
Generated in the upper atmosphere, C-14 makes up only 0.00000000010% of all carbon atoms. This is the same as 1 atom of C-14 per every____ atoms of Carbon.
1 thousand
1 million
1 Billion
1000 Billion or 1 Trillion
no way to know
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