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 for calcgj 7wplvpir;a23+vu )8qwr nsey8d 0* ium 3q*7kupn ;oum -afml4(y3 ynj09 are 20 and 39, respectively. How many protons are i* y;0fnlnqj-a( mpo kmuyu734 n 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