An Element Has a Weight of 131

question 73

Multiple Choice

An element has a weight of 131.3. The reason the number is not a whole number is that

• A) the atomic weight includes the weight of electrons.
• B) atomic weight is the average of the mass numbers of all the element's isotopes.
• C) the neutrons do not have a single unit weight.
• D) the atomic weight does not include the weight of protons.
• E) the number of electrons may vary.

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