The Gell-Mann–Nishijima formula was proposed by an American physicist who received a Nobel Prize in what year?
Gell-Mann–Nishijima formula: The Gell-Mann–Nishijima formula (sometimes known as the NNG formula) relates the baryon number "B", the strangeness "S", the isospin "I" of quarks and hadrons to the electric charge "Q". Gell-Mann–Nishijima formula:  Murray Gell-Mann proposed the formula independently in 1956. Murray Gell-Mann: Murray Gell-Mann ( ; born September 15, 1929) is an American physicist who received the 1969 Nobel Prize in physics for his work on the theory of elementary particles.
1969