Physics Unit30: Nuclear Physics and Radioactivity (id: 42e030263)

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本题目来源于试卷: Physics Unit30: Nuclear Physics and Radioactivity，类别为 Generic Physics

[单选题]
The atomic number and mass (,1*n zqldsm4yh;ahj number 2q dnd0nj0y,a for calcium 39 are 20 and 39, respectively. How many nucleons are indq00j, dnan 2y one atom?

A. 1
B. 19
C. 20
D. 39


参考答案:  D


本题详细解析: 暂无