In this chapter, the following topics are important for long questions in board exams:

1. Arrangement of Elements in the Periodic Table

Explain how elements are arranged in the periodic table. Describe the modern periodic table, periods, groups, and the significance of atomic number. Also explain the position of metals, non-metals, and metalloids.

2. Blocks of the Periodic Table (s, p, d, f)

Explain that the periodic table is divided into four blocks based on the subshell (s, p, d, f) that receives the last electron. Describe the location and characteristics of each block.

3. Electron Configuration from Periodic Table Position

Explain how to deduce the electron configuration of an atom from its position in the periodic table. Also show how to find the position of an element from its electron configuration (based on s, p, d, f subshells).

4. Periodic Trends – Atomic Radius, Ionic Radius, Ionization Energy, Electron Affinity, Electronegativity

Explain the trends in atomic radius, ionic radius, ionization energy, electron affinity, and electronegativity across a period and down a group. Explain why these trends exist (nuclear charge, shielding effect, etc.).

5. Trends in Group 1 and Group 17

Explain the trends in ionization energy and electron affinity for Group 1 (alkali metals) and Group 17 (halogens). Compare the reactivity and trends within each group.

6. Metallic and Non-Metallic Behavior

Explain how metallic and non-metallic behavior changes across a period and down a group. Relate these trends to valence electrons and ionization energy.

7. Reactions of Oxides and Chlorides with Water

Describe the reactions of oxides (acidic and basic) with water, including the pH of the resulting solutions. Also explain the reactions of chlorides with water and the pH of the solutions obtained.

8. Amphoteric Behavior (NaOH and Mg(OH)₂)

Explain the acid/base behavior of oxides and hydroxides, with special focus on amphoteric behavior (reactions with both acids and bases). Include equations for NaOH and Mg(OH)₂.

9. Oxidation Numbers of Oxides and Chlorides

Explain the variation in oxidation numbers of oxides and chlorides (e.g., NaCl, MgCl₂, Na₂O, MgO) in terms of outer shell (valence shell) electrons.

10. Reactions of Na and Mg with Oxygen, Chlorine, and Water

Write balanced equations for the reactions of sodium (Na) and magnesium (Mg) with oxygen, chlorine, and water. Explain the trends in bonding and electronegativity.