Which pair has approximately the same mass?
A) a hydrogen, H-1, atom, and a deuterium, H-2 atom
B) a proton and a neutron
Answer: B) a proton and a neutron
Which pair has approximately the same mass?
A) a hydrogen, H-1, atom, and a deuterium, H-2 atom
B) a proton and a neutron
Answer: B) a proton and a neutron