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ConcepTest: Isotope Mass and Atomic Number

ConcepTest questions by David McConnell , David Steer , Walter Borowski, Jeffrey Dick, Annabelle Foos, Jeffrey Knott, Alvin Konigsberg, Michelle Malone, Heidi McGrew, Kathie Owens, and Stephen Van Horn

Question:

The isotope of element X has 15 protons, 17 neutrons, and 15 electrons. The element has an atomic number of ____ and a mass number of ____.

a. 15; 32
b. 17; 15
c. 17; 47
d. 15; 30

Student Responses:

No data yet. The correct response is a.

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