(a) state the relative charges and approximate relative masses of a proton, a neutron and an electron<br />(b) *describe, with the aid of diagrams, the structure of an atom as containing protons and neutrons<br />(nucleons) in the nucleus and electrons arranged in shells (energy levels) (no knowledge of s, p, d<br />and f classifi cation will be expected; a copy of the Periodic Table will be available in Papers 1 and 2)<br />(c) defi ne proton number and nucleon number<br />(d) interpret and use symbols such as 12<br />6C<br />(e) defi ne the term isotopes<br />(f) deduce the numbers of protons, neutrons and electrons in atoms and ions from proton and nucleon<br />numbers<br />(g) state that some isotopes are radioactive
