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John Alexander Reina Newlands (1837-1898) was an English chemist who first published his findings in 1865. His major findings were the rule of eight, musical analogy, pionerring periodicity, applicable to lighter elements. -
Neils Bohr was a physics major who created the planetary model of the atom by proposing that electrons orbit the nucleus in fixed paths. He discovered that electrons jump between energy levels by absorbing or releasing energy, explaining atomic spectra.