Class 11 Chemistry Classification of Elements and Periodicity in Properties Exam Questions

Read the Class 11 Chemistry Classification of Elements and Periodicity in Properties Exam Questions below. Find downloadable advanced study resources for 2026-27 built to support Class 11 Chemistry students with thorough revision notes and question sets. Each guide follows current testing guidelines from CBSE, NCERT, and KVS.

Useful Resources: Class 11 Chemistry Chapter 3 Classification of Elements and Periodicity in Properties

To achieve a high score in Chemistry, students must go beyond standard textbooks. This Class 11 Chapter 3 Classification of Elements and Periodicity in Properties study material includes conceptual summaries and solved practice questions to improve your understanding.

Class 11 Chemistry Chapter 3 Classification of Elements and Periodicity in Properties Advanced Resources

LEVEL 1

 

1. What would be the IUPAC name and symbol for the element of atomic no.120?

Ans: Unbinilium (Ubn)

 

2. State Mendeleev’s periodic law.

Ans: Physical and chemical properties of elements are the periodic function of their atomic masses.

 

3. How many groups are there in the p-block of periodic table?

Ans: 6


4. Explain the term electron gain enthalpy.

Ans: The enthalpy change taking place by attracting an electron towards its outermost shell of an isolated gaseous atom.

 

5. What are lanthanides and actinides?

Ans: (a) Lanthanides: Elements in which last electron enter in 4f sub-shell of antepenultimate shell.

       (b) Actinides: Elements in which last electron enter in 5f sub-shell of antepenultimate shell.

 

6.What is the general electronic configuration of d-block elements?

Ans: 

Class 11 Chemistry Classification of Elements and Periodicity in Properties Exam Questions

 

7. Arrange the following in increasing order of ionization enthalpy:- B, C, N, O.

Ans: 

Class 11 Chemistry Classification of Elements and Periodicity in Properties Exam Questions-1

 

8. Arrange the elements in increasing order of their size:- Class 11 Chemistry Classification of Elements and Periodicity in Properties Exam Questions-2

Ans: 

 Class 11 Chemistry Classification of Elements and Periodicity in Properties Exam Questions-3

 

9. Which has the highest value of electron gain enthalpy fluorine or chlorine?

Ans: Chlorine

 

10. Name the first element having an incomplete 3d-level.

Ans: Na

 

LEVEL-2

1. What is diagonal relationship?
Ans: Due to similar charge/size ratio element of second period are diagonally related with the third period element like Li is diagonally related to Mg.
 
 
2. How are Li and Mg related to each other in the periodic table? Write the name of another pair having such a relationship?
Ans: Diagonal relationship. Be and Al
 
 
3. Write down the main characteristic of p block elements?
Ans: In these elements the last electron entering p sub-shell of last shell.
 
 
4. Noble gases have zero electron affinity. Why?
Ans: due to completely filled duplet or Octet.
 
 
5. Account for the low values of electron affinities of nitrogen and phosphorus?
Ans: Half filled p subshell in N and P.
 
 
6. What are f block elements? By which alternative name are they known and why?
Ans: Elements in which last electron enter in f sub-shell of antepenultimate shell. They are called inner transition elements.
 
 
7. What are isoelectronic ions? Account for the decrease in size of following species oxide ion >Fluoride ion>sodium ion>magnesium ion
Ans: The ions having same number of electrons are called isoelectronic ions. the above order is due to increasing order of effective nuclear charge.
 
 
8. Why ionization of d block elements does remain constant?
Ans: Due to Screening/shielding effect.
 
LEVEL -3

 
1. What is modern periodic law? How does it in the removal of some of the anomalies of the Mendeleev’s periodic table?
Ans: Modern Periodic law states that “the physical and chemical properties of the elements are periodic functions of their atomic numbers”. When atomic number is taken as fundamental property then abnormalities like position of isotope, anomalous pair itself removed.
 
 
2. Explain
a. Dobereiner triads
b. Newlands law of octaves.
Ans: Dobereiner triads: He make a group of three elements in such a way that the average of atomic masses of 1st and 3rd elements is equal to the atomic mass of the middle one such as Li, Na and K. Newlands law of Octaves: When elements were arranged in such a way that the physical and chemical properties of each eighth element were resembling.
 
 
3. Classify the elements into four blocks on the basis of electronic configuration?
Ans: On the basis of electronic configuration
a) s block elements
b) p block elements
c) d block elements
d) f block elements
 
 
4. Describe the characteristics of s-block elements?
Ans: Characteristics of s-block elements:
i) All the elements are soft metals.
ii) They have low melting and boiling points.
iii) They are highly reactive in nature.
iv) Most of them impart characteristic colours to the flame.
v) They form ionic compounds by losing their valence electrons and, thus, show oxidation states of +1 and +2 in their compounds.
vi) The elements are good reducing agents.
vii) All of them are good conductors of heat and electricity.
 
 
5. With reference to periodic table indicate,
a. Element that is in group 13 and third period both.
b. First transition element of the fourth period.
Ans: (a) Al (b) Sc
 
 
6. What do you mean by atomic radii? Discuss its variation in periodic table?
Ans: Atomic radius may be defined as the distance from the centre of the nucleus to the outermost shell containing the electrons.
The exact determination of the atomic radius of an element is not as simple as expected because:
• Along a period the atomic radii of the elements generally decreases from left to the right. It is due to increased nuclear charge from left to the right.
• The atomic radii of the elements in every group of the p[periodic table increases as we move downwards.
 
 
7. What do you mean by electro negativity? Discuss its variation in periodic table?
Ans: The electronegativity of an element is defined as the relative electron attractive tendency of its atom for a shared pair of electrons in a chemical bond.
• It depends upon the nature of the atom with which a particular atom is linked. Different scales of comparison have been given for this purpose.
• It increases along the period and decreases down the group.
 
 
8. The electronic configuration of A is 
Class 11 Chemistry Classification of Elements and Periodicity in Properties Exam Questions-4
a. To which period does it belong?
b. Write down the formula of the nitrate of A.
c. state whether a solution of nitrate is conductor of electricity or not
Ans: (a) Third period
(b) A (NO3) 2
(c) Conductor of electricity
 
 
9. The ionic radii of alkaline earth metals are smaller than those of alkali metals. Why?
Ans: Effective nuclear charge increases so the radius of alkaline earth metal decreases.
 
 
 

Free study material for Chemistry

CBSE Class 11 Chemistry Study Material: Chapter 3 Classification of Elements and Periodicity in Properties

Core Study Kit: Class 11 Chemistry Chapter 3 Classification of Elements and Periodicity in Properties

Explore a complete collection of valuable study tools for Chapter 3 Classification of Elements and Periodicity in Properties right here. Designed to align with the latest 2026 Class 11 Chemistry guidelines, the portfolio includes comprehensive notes, intuitive Mind Maps, and high-probability Sure Shot Questions tailored for CBSE exams. Integrating these assets into your daily routine streamlines comprehension.

Understanding Marking Schemes with Solved Examples

Crafted with reference to the authoritative NCERT book for Class 11 Chemistry, these teaching tools ensure precise curriculum matching. Real board questions and structured solutions are provided to illustrate standard marking schemes. Pair your study of the chapter notes with hands-on practice problems, checking your results against our dedicated NCERT solutions for Class 11 Chemistry.

All-Inclusive Exam Preparation for Chemistry

Securing top scores in your Class 11 evaluations requires pairing these chapter notes with official Chemistry Sample Papers. Incorporating our online MCQ Tests for Chapter 3 Classification of Elements and Periodicity in Properties into your daily study regime builds both response speed and precision. Every asset hosted on our platform is entirely free and continuously updated to keep Class 11 learners ahead of the curve and fully confident for school exams.

FAQs

What is included in the advanced study material for Class 11 Chemistry Chapter 3 Classification of Elements and Periodicity in Properties?

Our advanced study package for Chapter 3 Classification of Elements and Periodicity in Properties includes detailed concepts, diagrams, Mind Maps, and explanation of complex topics to ensure Class 11 students learn as per syllabus for 2026 exams.

How do Mind Maps for Chemistry Chapter 3 Classification of Elements and Periodicity in Properties help in revision?

The Mind Maps provided for Chapter 3 Classification of Elements and Periodicity in Properties act as visual anchors which will help faster recall during high-pressure exams.

Are these Chemistry resources suitable for both classroom teaching and self-study?

Yes, teachers use our Class 11 Chemistry resources for lesson planning as they are in simple language and have lot of solved examples.

Is this advanced study material for Chapter 3 Classification of Elements and Periodicity in Properties free to download in PDF?

Yes, You can download the complete, mobile-friendly PDF of the Chemistry Chapter 3 Classification of Elements and Periodicity in Properties advanced resources for free.

Does this material cover rationalized content for the 2026-27 CBSE session?

Yes, our subject matter experts have updated the Chapter 3 Classification of Elements and Periodicity in Properties material to align with the rationalized NCERT textbooks and have removed deleted topics and added new competency-based questions.