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

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Post time 2024-1-22 01:01:29 | Show all posts |Read mode
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 n5k 1zj:0;mvnl njp ex1;vnp s5umber for calcium 39 are v8e2b e(nxab+j-k o9e 20 and 39, respectively. How many electrons are in one j+9ek 2beaxob (ne8v-atom?

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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