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Library of Conceptual Questions (CQs): Atomic Structure
Before neutrons were discovered some scientists believed the nucleus consisted of a mixture of protons and electrons. What atomic properties did this model explain? Discuss how the model explained these properties.
A chlorine atom, Cl, is converted to a negative ion, Cl-, then to a positive ion, Cl+.  The species that has the largest mass is

 (a) the chlorine atom.
 (b) the negative ion.
 (c) the positive ion.
 (d) None of the above are correct because all of these species have the same mass.

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