Rutherford proposed the existence of neutron
G. Existence has written: 'Village'
who
Nainital
That would be Alfred Wegener
Neisser
‎J. J. Thomson discovered the electron in experiments done in 1897.
What_did_M_gell_Mann_and_g_Zweig_proposed
The Newbery Medal was proposed by Frederic G. Melcher in the year 1921.
The Greeks theorized the existence of an opposite to the Arctic when Pythagoras proposed that the Earth was round -- in about 530 B.C.
After experiments with cathode rays Thomson discovered that these rays are deflected in an electrical field; and from this he proposed the existence of electrons.
Both Murray Gell-Mann and George Zweig (working independently) proposed quarks in 1964.