本题目来源于试卷: Physics Unit30: Nuclear Physics and Radioactivity,类别为 Generic Physics
[单选题]
An atom's mass number aryrx rw( wt9 msfc3sh i-).:8)wv6ygis determined m 9*w( 0 z+phfez;nnatby the number of
A. neutrons in its nucleus.
B. nucleons in its nucleus.
C. protons in its nucleus.
D. alpha particles in its nucleus.
参考答案: B
本题详细解析:
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