Atomic structure - AQA Atoms consist of a nucleus containing protons and neutrons, surrounded by electrons in shells. The number of subatomic particles ... in physical properties, such as boiling ...

Photo: Niels Bohr's research notes for his new atomic theory Rutherford's find ... Rutherford was shooting a beam of alpha particles (or alpha rays, emitted by the radioactive element radium ...

They explain the relative masses, sizes, locations and charges of these subatomic particles ... the link between the number of protons and the atomic number, between protons and neutrons and ...