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Author Question: Carbon-12 is the most common isotope of carbon, and has an atomic mass of 12 dal (Read 1985 times)

Hawke

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on: May 25, 2013
Carbon-12 is the most common isotope of carbon, and has an atomic mass of 12 daltons. A mole of carbon in naturally occurring coal, however, weighs slightly more than 12 grams. Why?
A) The atomic mass does not include the mass of electrons.
B) Some carbon atoms in nature have an extra proton.
C) Some carbon atoms in nature have more neutrons.
D) Some carbon atoms in nature have a different valence electron distribution.
E) Some carbon atoms in nature have undergone radioactive decay.


Melanie

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Reply #1 on: May 28, 2013
Quote from: Hawke on May 25, 2013
C) Some carbon atoms in nature have more neutrons.


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Hawke

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Reply #2 on: Jul 3, 2013
Thanks ;) It was right.


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