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 number e2oew- p*1s iqfor calcium 39 are 20 and 39, resp 7nlg g bgb)+uwz;aqi*whoi4:0yy o):ectively. How many0)wy lwh y;g:ouo ig* bizbag+7) q:n4 protons 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
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Post time 2024-1-22 01:01:29