[单选题]
The mass of an atom +tcs,d v3/ 699nx1ag yr ycitqisc we3xf,g+(q lq.rxf 8
A. approximately equally divided between neutrons, protons, and electrons.
B. evenly divided between the nucleus and the surrounding electron cloud.
C. concentrated in the cloud of electrons surrounding the nucleus.
D. concentrated in the nucleus.
Post time 2024-1-22 01:01:29