ConcepTest: Isotope Mass and Atomic Number
This material was originally created for
Starting Point:Introductory Geology and is replicated here as part of the SERC Pedagogic Service.
Initial Publication Date: May 8, 2006
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
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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