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 calcium 39 are 2k.)d2k6fv.p t j/kkfj0 and 39, respeac(g;3a obo zvt p1me ;0jt(+jtaj t-7ctively. How ma j (o0a-bae3 a+tt71(;ozgj;tmcvtpj ny neutrons are in one atom?
A. 1
B. 19
C. 20
D. 39
参考答案: B
本题详细解析:
暂无
|