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Based on the diagram, which of the following statements best describes the observed pattern of abundances for elements with an atomic number between 6 and 20? There is a general trend of decreasing abundance with increasing atomic number, but elements with even atomic numbers tend to be more abundant than those with odd atomic numbers. These abundances decrease smoothly from atomic number of 6 to atomic number of 20. These abundances fluctuate randomly. There is a general trend of increasing abundance with increasing atomic number, but elements with odd atomic numbers tend to be more abundant than those with even atomic numbers. All of the abundances are about the same.

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