(a)[1]
State which particles in this list are present in the nucleus of an atom.
(b(ii))[2]
Calculate the relative atomic mass of this sulfur sample to one decimal place.
(b(iii))[1]
The relative atomic masses of all elements are measured against one atom of an isotope. Identify this isotope.
(c)[2]
Give the formula for one atom and one positive ion that have the same electronic configuration as $O^{2-}$.