Assertion: hydrogen atom's nucleus | /r/HasProperty | neutron
Facets:
Source sentences:
text: After the discovery of the neutron in 1932, models for a nucleus composed of protons and neutrons were quickly developed by Dmitri Ivanenko and Werner Heisenberg.
text: He described it as a positively charged nucleus, comprised of protons and neutrons, surrounded by a negatively charged electron cloud.
text: The nucleus is made of one or more protons and a number of neutrons.