Assertion: neutron | /r/HasProperty | needed
Facets:
Source sentences:
text: The ratio is 1.5:1, the reason for this difference is because of the repulsive force between protons: the stronger the repulsion force, the more neutrons are needed to stabilize the nuclei.
text: For this reason, one or more neutrons are necessary for two or more protons to be bound into a nucleus.