Interpret and use symbols for atoms, e.g. ( ^{12}_{6}C ), and ions, e.g. ( ^{35}_{17}Cl^{-} )

Describe the giant covalent structures of graphite and diamond

Describe relative atomic mass, ( A_r ), as the average mass of the isotopes of an element compared to 1/12th of the mass of an atom of ( ^{12}C )