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.
(a) (i) Determine the charge, in C, of a nucleus. (ii) A positive ion with a nucleus has a charge of 4.80 Ã 10â19 C. Determine how many electrons are in this ion. (b) A nucleus may decay by emitting two â particles to form a plutonium nucleus.