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Important Questions

Chemistry

Classification Of Elements And Periodicity In Properties

Classification Of Elements And Periodicity In Properties Important Questions for NEET Chemistry - 2026

Q: 1. What are the most important NEET question types asked from the Classification Of Elements And Periodicity In Properties chapter?

This chapter often features MCQs, assertion-reason questions, and statement-based questions in NEET. Commonly, questions focus on periodic trends, atomic structure, and properties of elements. Prepare by practicing concept application and trend-based numericals to improve your accuracy.

Q: 2. Which periodic trends should I focus on for exam-focused questions in this chapter?

Pay special attention to trends like atomic/ionic radii, ionization enthalpy, electron gain enthalpy, and electronegativity. NEET MCQs often ask you to arrange elements, compare values, or predict reactivity based on these trends. Practice identifying these patterns quickly.

Q: 3. How are s, p, d, and f block elements tested in NEET important questions?

Expect chapter-wise practice questions on block definitions, properties, and position in the modern periodic table. You may be asked to:Identify block of given elementsCompare chemical reactivityRelate electronic configuration to placement

Q: 4. What are some common topics for assertion reason questions from this chapter?

Assertion-reason questions often target:Periodic law and exceptionsTrends in oxidation states and valencyUnexpected changes in atomic/ionic size across periodsRead each statement carefully and relate it back to your periodic trends understanding.

Q: 5. Are numericals and calculation-based NEET questions relevant for this chapter?

Yes, occasional numerical questions ask you to calculate atomic or ionic radius, predict the period/group of an element using atomic number, or compare ionization energies. Practice basic calculation and be clear on trends and exceptions to solve these quickly.

Q: 7. What targeted revision strategy is effective for this chapter’s NEET expected questions?

For efficient revision, focus first on periodic trends and their exceptions, then solve chapter-wise practice MCQs and assertion reason questions. Review summary tables and charts just before the exam. Reinforce your weak areas with regular timed quizzes for best results.

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Practice Classification Of Elements And Periodicity In Properties Important Questions - Free PDF Download

Chemistry for NEET includes the chapter Classification Of Elements And Periodicity In Properties. This topic helps you understand how elements are arranged and why their properties repeat. Learning from Vedantu’s NEET Important Questions with Answers makes it easier to master this chapter.

You will study the modern periodic law and the structure of the periodic table. Topics also cover s, p, d, and f block elements, along with trends in atomic and ionic size, ionization enthalpy, electron gain enthalpy, and other properties. Concepts like valence, oxidation states, and chemical reactivity are also included.

Practicing these important NEET questions lets you revise core topics and test your knowledge. These questions help clear doubts and improve exam skills. You can download the free PDF for Vedantu’s NEET Important Questions and Answers for this chapter now.

Practice Classification Of Elements And Periodicity In Properties Important Questions - Free PDF Download

1. Multiple choice questions.

Q1. The modern periodic law states that the properties of elements are a periodic function of their:

(a) Mass number
(b) Atomic number
(c) Atomic mass
(d) Number of neutrons

Answer: (b) Atomic number.

Q2. Which group in the modern periodic table contains only p-block elements?

(a) Group 1
(b) Group 2
(c) Group 17
(d) Group 3

Answer: (c) Group 17.

Q3. Which of the following elements has the largest atomic radius?

(a) Na
(b) Mg
(c) Si
(d) Cl

Answer: (a) Na.

Q4. Electron gain enthalpy becomes more negative across a period because:

(a) Nuclear charge decreases
(b) Atomic size increases
(c) Nuclear charge increases and atomic size decreases
(d) Shielding effect increases

Answer: (c) Nuclear charge increases and atomic size decreases.

2. Very Short Answer (VSA).

Q1. Define modern periodic law.

Answer: Modern periodic law states that the physical and chemical properties of elements are a periodic function of their atomic numbers.

Q2. What are the d-block elements?

Answer: d-block elements are those in which the last electron enters the d-orbital. They are found in groups 3 to 12 of the periodic table.

Q3. State one periodic trend of ionization enthalpy across a period.

Answer: Ionization enthalpy generally increases across a period due to increasing nuclear charge and decreasing atomic size.

3. Short Answer Questions.

Q1. Explain the difference in chemical reactivity between alkali metals and halogens, based on their periodic table positions.

Answer: Alkali metals are highly reactive because they have one valence electron, which they tend to lose easily, forming positive ions. Halogens, being in Group 17, have seven valence electrons and tend to gain one electron readily to complete their octet, making them highly reactive nonmetals.

Q2. Discuss how atomic radius varies down a group and across a period, giving reasons.

Answer: Down a group, atomic radius increases as each element has an extra shell. Across a period, atomic radius decreases due to increased nuclear charge pulling electrons closer while added electrons enter the same shell.

Q3. How does the oxidation state of transition elements differ from s-block elements?

Answer: Transition elements (d-block) show variable oxidation states due to involvement of d-electrons in bonding, while s-block elements generally exhibit a fixed oxidation state equal to their group number (+1 for alkali, +2 for alkaline earth metals).

4. True or False Questions.

Q1. First ionization enthalpy of sodium is higher than that of magnesium.

Answer: False.

Q2. All f-block elements are placed in a separate panel at the bottom of the periodic table.

Answer: True.

3. Fill in the Blanks Questions.

Q1. The element with the highest electron gain enthalpy in the periodic table is ________.

Answer: Chlorine.

Q2. The valency of an element in group 16 is generally ________.

Answer: Two.

How periodic table concepts help NEET Chemistry students

Learning about the periodic table trends and classification of elements builds a solid foundation for NEET Chemistry. Understanding atomic size, ionization enthalpy, and periodicity can make many questions feel much easier for exam-day success.

Knowing the difference between s, p, d, and f block elements helps in quick revision and smart elimination in MCQs. Get comfortable with oxidation states and chemical reactivity to solve NEET problems confidently and save valuable time.

The modern periodic law and present table format simplify learning trends in properties like atomic radius and electron gain enthalpy. Focused practice with such topics boosts your confidence and gets you ready for NEET Chemistry questions with Vedantu by your side.

FAQs on Classification Of Elements And Periodicity In Properties Important Questions for NEET Chemistry - 2026

1. What are the most important NEET question types asked from the Classification Of Elements And Periodicity In Properties chapter?

This chapter often features MCQs, assertion-reason questions, and statement-based questions in NEET. Commonly, questions focus on periodic trends, atomic structure, and properties of elements. Prepare by practicing concept application and trend-based numericals to improve your accuracy.

2. Which periodic trends should I focus on for exam-focused questions in this chapter?

Pay special attention to trends like atomic/ionic radii, ionization enthalpy, electron gain enthalpy, and electronegativity. NEET MCQs often ask you to arrange elements, compare values, or predict reactivity based on these trends. Practice identifying these patterns quickly.

3. How are s, p, d, and f block elements tested in NEET important questions?

Expect chapter-wise practice questions on block definitions, properties, and position in the modern periodic table. You may be asked to:

Identify block of given elements
Compare chemical reactivity
Relate electronic configuration to placement

4. What are some common topics for assertion reason questions from this chapter?

Assertion-reason questions often target:

Periodic law and exceptions
Trends in oxidation states and valency
Unexpected changes in atomic/ionic size across periods

Read each statement carefully and relate it back to your periodic trends understanding.

5. Are numericals and calculation-based NEET questions relevant for this chapter?

Yes, occasional numerical questions ask you to calculate atomic or ionic radius, predict the period/group of an element using atomic number, or compare ionization energies. Practice basic calculation and be clear on trends and exceptions to solve these quickly.

6. How can I avoid common mistakes while answering NEET important questions from this chapter?

Students often mix up groups and periods, or overlook exceptions in periodic trends. To avoid mistakes:

Draw a blank periodic table for quick reference
Highlight exceptions and memorize them
Practice with mixed question types (MCQs, assertion-reason, numericals)

7. What targeted revision strategy is effective for this chapter’s NEET expected questions?

For efficient revision, focus first on periodic trends and their exceptions, then solve chapter-wise practice MCQs and assertion reason questions. Review summary tables and charts just before the exam. Reinforce your weak areas with regular timed quizzes for best results.