Important Questions

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Very Short Answer Questions

1–2 Marks

1. What is meant by classification of elements?
2. What does the term periodicity indicate in chemistry?
3. On what basis is the modern periodic table arranged?
4. What is meant by atomic number?
5. What information does a period give about an element?
6. Why do elements in the same group show similar properties?
7. What is meant by valency?
8. Why are noble gases chemically inactive?
9. Which type of elements are placed on the left side of the periodic table?
10. What happens to atomic size when we move down a group?

Short Answer Questions

3–4 Marks

1. Why is classification of elements necessary? Explain.
   Explanation & Importance
2. State the modern periodic law in your own words.
   Definition & Interpretation
3. Explain the arrangement of elements in periods and groups.
   Structural Explanation
4. How does electronic configuration decide the position of an element?
   Electronic Configuration & Position
5. Explain the variation of atomic size across a period.
   Trend Analysis
6. Why does metallic character decrease across a period?
   Character Variation
7. Explain why elements of the same group show similar chemical properties.
   Group Characteristics
8. What is the significance of valence electrons in periodic classification?
   Valence Electrons Role
9. Explain the position and properties of noble gases.
   Group 18 Elements
10. Why is the position of hydrogen considered unique?
    Special Case Analysis

Long Answer Questions

5 Marks

1. Explain the modern periodic table and its main features.
   Comprehensive Explanation
2. Describe how periodic trends help in predicting properties of elements.
   Predictive Analysis
3. Explain the variation of metallic and non-metallic character in the periodic table.
   Character Variation Analysis
4. Discuss the importance of the modern periodic table in the study of chemistry.
   Significance & Application
5. Explain how reactivity of elements changes within a group and a period.
   Reactivity Trends

Reasoning / Thinking-Based Questions

Conceptual Understanding

1. Why do elements with the same number of valence electrons have similar properties?
   Electronic Basis of Properties
2. Why does atomic size increase when moving down a group?
   Atomic Structure Reasoning
3. Why are alkali metals highly reactive?
   Group 1 Elements Analysis
4. Why are halogens very reactive non-metals?
   Group 17 Elements Analysis
5. Why are noble gases placed in a separate group?
   Unique Group Characteristics