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.
discovered that most mass and charge of atom was concentrated a small volume, shot alpha particles at gold foil, found deflection (thought it was solid ball), planetary model of atom (central nucleus with positive charge and most of mass surrounded by a ring of very small, negatively charged electrons)