It also tells us that chlorine has 18 neutrons (35 - 17) and, as the number of electrons and protons are equal in a neutral atom, chlorine also has 17 electrons. The relative mass of a nucleus is ...

The questions in this quiz are suitable for GCSE physics students studying developing the atom, Rutherford and the nucleus and further developments to the atomic model. If you struggled with the ...

The size of an atom is only a few angstroms at most - there are 10 billion angstroms in 1 metre. This video also looks at the ...

Physicists from both New Zealand and Britain have been credited with splitting the atom — but there is consensus that it was not an American.