(a) Which of the following compounds has the greatest ionic character? PCl5, SiCl4, CCl4, BCl3
(b) Which of the following ions has the smallest ionic radius? F-, C4-, N3-, O2-
(c) Which of the following atoms has the highest ionization energy? F, Cl, Br, I
(d) Which of the following oxides is most acidic? H2O, SiO2, CO2