Physics Unit30: Nuclear Physics and Radioactivity (id: 85a915d17)

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 t p dwv+ilz4j8b f17(xh 05hdmal3*n ynuaq,gct- gd(k*- e/mzh mber for calcium 39 are 20 and 39, respectively. How many electrons are in one atom?m/(t -dcqghaz -kg*,e

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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