Multiple Choice
List the number of protons, neutrons, and nucleons (protons + neutrons) , in that order, for an isotope with the symbol: 
A) 56, 81, 137
B) 81, 56, 137
C) 56, 137, 193
D) 137, 56, 193
E) 81, 137, 218
Correct Answer:

Verified
Correct Answer:
Verified
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