atomic structure

Question 1

what are the relative charges and masses of sub atomic particles

Answer 1

charge: p 1 n 0 e -1
mass: p 1 n 1 e 1/1840

Question 2

describe the arrangement of sub atomic particles

Answer 2

nucleons in centre (p+n) held by strong nuclear force, much stronger than electrostatic forces of attraction between p+e so overcomes repulsion of p in nucleus. electrons surround nucleus in a series of energy levels.