Question: What was the nationality was the person who established the essential nature of the atomic nucleus?
Sentence (from "James Chadwick"): Sir James Chadwick, {'1': ", '2': ", '3': ", '4': "} (20 October 1891 – 24 July 1974) was an English physicist who was awarded the 1935 Nobel Prize in Physics for his discovery of the neutron in 1932.
Relevant evidence: Yes