Physics Unit30: Nuclear Physics and Radioactivity (id: 4a01d23db)

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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 number for calqo4x(bp .er ztu,a d83cium 39 are 20 and 39, respectively. H3r8 qu(de.oap b4zt,xkb z9dcn0yi -5ow many9cdz-n5k0b yi protons are in one atom?

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


参考答案:  C


本题详细解析: 暂无