Assessment Objectives

Detailed Breakdown: Periodic Table & Trends

• Define electronegativity, first ionization energy, electron affinity, and periodicity.
• Explain the decrease in atomic radius across Period 3 ($\ce{Na}$ to $\ce{Ar}$).
• Describe the trend in ionic radii for isoelectronic ions like $\ce{N^3-, O^2-, F-, Na+, Mg^2+, \text{ and } Al^3+}$.
• Discuss the physical properties and reactions of Group 1 and Group 17 elements.
• Relate the acid-base character of oxides to their metallic or non-metallic nature.
• Deduce the group of an element from a graph showing its successive ionization energies.
• Compare the trends in oxides across Period 3 (from basic $\ce{Na2O}$ to acidic $\ce{SO3}$).
• Predict the properties of an 'unknown' element given its position in the d-block or p-block.