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 国际高中通用物理

[单选题]
The atomic number and y gb,/x6kb 4(,ew;+ rw bbpzqxma1stdq:pn/mg/r-q ,me s5oh 4vss number for calcium 39 are 20 and 39, respectively. How many protons are in one atom?hn s dpq-/m/:oev 41,r5s qgmt

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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