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.
Ernest Rutherford demonstrated that the atom has an internal structure of a small, dense nucleus about which negatively charged electrons circle in orbits. (New Zealand). Rutherford formulated a model of the atom, which was like this: a very small positively charged nucleus, orbited by electrons.