1.1 Briefly define the following terms:
(a) Electronegativity
(b) Electron affinity
(c) Ionization energy
[6]
1.2 Explain why the first ionization energy for oxygen is lower than that for nitrogen. [4]
1.3 Does the reactivity of a metal correlate with its first ionization enérgy? Explain. [6]
1.4 Predict whether each of the following oxides is ionic or molecular: $SnO_2$, $Al_2O_3$, $CO_2$, $Li_2O$,
$Fe_2O_3$, $H_2O$. Explain the reasons for your choices.
[9]
QUESTION 2
2.1 Draw the Lewis structures for $NH_4$, $CO$, $NO^+$ and $SO_2^{2-}$.
[12]
2.2 Is the acetylide ion, $C_2^{2-}$, isoelectronic with $N_2$?
[4]
2.3 Use Lewis structures and the VSEPR model to determine the electron-pair and molecular
geometries for (a) the phosphate ion, $PO_4^{3-}$, (b) the sulfide ion, $SO_3^{2-}$, (c) $IF_5$.
[9]
