5. Most rare earth elements are: a) naturally occurring.
b) highly reactive.
c) inactive in nature.
d) man-made.
e) None of the above.
I need help fast
15 points

is has three carbons, so the answer is propylamine.

meth-

eth-

prop-

but-

pent-

hex-

hept-

oct-

non-

explanation:

c-14 is carbon-14, or radiocarbon.   it is a radioactive isotope of carbon with an atomic nucleus containing 6 protons and 8 neutrons.

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