What do they look like? Tree swallows are small birds (about 14 cm long) with long wings and small legs and feet. They are irridescent greenish-blue on their head, shoulders and back, and white their chin, breast and belly. Tree swallows have a short black beak and dark brownish feet.
Ernest Rutherford concluded that an atom contains a very small, dense center, called a nucleus, with a positive charge as a result of his gold foil experiment.
In 1911 the existence of the atomic nucleus was discovered by  Ernest Rutherford through his interpretation of the gold foil  experiment conducted two years earlier by Hans â¦ Geiger and Ernest  Marsden.In 1932 Dmitry Ivanenko proposed the proton-neutron model  of the nucleus. Answered.In Science.he familiar alpha particle scattering by thin gold foil experiment has given evidence for the existence of hard nucleus at the central region of the atom.