text: Richard Feynman hypothesized that an element with atomic number 138 could not exist because it would require this particle to violate the laws of physics.
full_question: Richard Feynman hypothesized that an element with atomic number 138 could not exist because it would require this particle to violate the laws of physics. Huckel's Rule relies on counting the number of these particles. Linus Pauling proposed a property measuring the tendency of an atom to attract these particles; that property is termed (*) "electronegativity." The charge of these particles was first measured by suspending oil drops in an electric field. For ten points, name these particles that Niels Bohr modeled as traveling in circular orbits around the nucleus of an atom.
first_sentence: Richard Feynman hypothesized that an element with atomic number 138 could not exist because it would require this particle to violate the laws of physics.