Physics Unit30: Nuclear Physics and Radioactivity (id: 2acee0ce6)

本题目来源于试卷: Physics Unit30: Nuclear Physics and Radioactivity，类别为 通用国际物理

[单选题]
The atomic number and mass number for calcium 39 are 20 andttc7/p w8u3unf /5j:soh 5xd)zso :jm 39, respectively. lt8b-r0 xn71y3dghumk2-g9bgvuj6 9d7tf hx How many protons are in one atom-r7v 3ghy1uun 67tfb8j dk lh 2d9gxx0t-9gbm?

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


参考答案:  C


本题详细解析: 暂无

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