MCAT Question of the Day
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    Q:

    		 The standard atomic weight for chlorine is a weighted average of the mass of all stable isotopes and is approximately 35.5 g/mol. Using this information alone, which of the following must be true?
    		 

    A

    		 There is exactly one stable isotope of chlorine.

    B

    		 There is more than one stable isotope of chlorine.

    C

    		 There are exactly two stable isotopes of chlorine.

    D

    		 All isotopes of chlorine are present in roughly equal abundance.



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