Physics Unit30: Nuclear Physics and Radioactivity (id: 42e030263)

[单选题]
The atomic number and mass 2vbm q1hko6p h;* j+kwnumb)7(mdhljt ) mk4;,ayo4em vjm6)jy t eer for calcium 39 are 20 and 39, respectively. How many nucleons are in one a dvmay)jk ljme6(h ,ym)7o)4jt;4t metom?

A. 1
B. 19
C. 20
D. 39


参考答案:  D


本题详细解析: 暂无