In the Venn diagram comparing protons and neutrons, the shared property that would belong in the region marked "B" – the area of overlap between the blue circle (proton) and the pink circle (neutron) – is has mass of 1 amu.
Both protons and neutrons are types of nucleons, they both have a mass approximately equal to 1 atomic mass unit (amu).
The other options are specific to either protons or neutrons:
- "Is negatively charged" refers to electrons.
- "Orbits the nucleus" also refers to electrons.
- "Is positively charged" specifically refers to protons.
So, "has mass of 1 amu" is the appropriate shared property for the region marked "B".