Physics Unit30: Nuclear Physics and Radioactivity (id: 56dc6c2bd)

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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 mah1ibs* rja --yss number for calcium 39 are 20 and 39, re0i5of:ctzce 9go 2er4spectively. How many25c9z 4: eoetfic rgo0 electrons 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