This fact suggested an intimate relationship between the
internal structure of an atom and the spectrum of
radiation emitted by it In 1885, Johann Jakob Balmer
(1825 – 1898) obtained a simple empirical formula which
gave the wavelengths of a group of lines emitted by atomic
hydrogen Since hydrogen is simplest of the elements
known, we shall consider its spectrum in detail in this
chapter Ernst Rutherford (1871–1937), a former research
student of J