[单选题]
If an element of atom1wf (n:lb t5my 9n3: vg*x.jcx8x 0fjph 2tgtmic number 15 has an isotope of mass number 32,
A. the number of neutrons in the nucleus is 15.
B. the number of neutrons in the nucleus is 17.
C. the number of protons in the nucleus is 17.
D. the number of nucleons in the nucleus is 15.
Post time 2024-1-22 01:01:29