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, he suggested that atoms have their positive charge concentrated in a very small nucleus, and pioneering with the Rutherford model, through his discovery and interpret â¦ ation of Coulomb scattering in his gold foil experiment. He is widely credited with first splitting the atom in 1917.