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

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Advanced Study Material for 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 you understanding.

Class 11 Chemistry Chapter 3 Classification of Elements and Periodicity in Properties Notes and Questions

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.
 
 
 
Chapter 01 Some Basic Concepts of Chemistry
CBSE Class 11 Chemistry Basic Concepts Of Chemistry Important Questions
Class 11 Chemistry Basic Concepts of Chemistry Exam Questions
Chapter 02 Structure of Atom
CBSE Class 11 Chemistry Atomic Structure Flash Cards
Class 11 Chemistry Structure of Atom Exam Questions
Chapter 03 Classification of Elements and Periodicity in Properties
CBSE Class 11 Chemistry Periodic Classification Flash Cards
Class 11 Chemistry Classification of Elements and Periodicity in Properties Exam Questions
Chapter 04 Chemical Bonding and Molecular Structure
Class 11 Chemistry Chemical Bonding and Molecular Structure Exam Questions
Chapter 05 Thermodynamics
CBSE Class 11 Chemistry Thermodynamics Flash Cards
Class 11 Chemistry Thermodynamics Exam Questions
Chapter 06 Equilibrium
CBSE Class 11 Chemistry Equilibrium Flash Cards
Class 11 Chemistry Equilibrium Exam Questions
Chapter 07 Redox Reactions
Class 11 Chemistry Redox Reactions Exam Questions
Chapter 08 Organic Chemistry Some Basic Principles and Techniques
CBSE Class 11 Chemistry Organic Chemistry Flash Cards
Class 11 Chemistry Organic Chemistry Some Basic Principles and Techniques Exam Questions
Chapter 09 Hydrocarbons
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Minds Map
CBSE Class 11 Chemistry Minds Map All Chapters
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CBSE Class 11 Chemistry s block elements Flash Cards
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Class 11 Chemistry The p Block Element Exam Questions
Class 11 Chemistry The s Block Element Exam Questions

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

Students can find all the important study material for Chapter 3 Classification of Elements and Periodicity in Properties on this page. This collection includes detailed notes, Mind Maps for quick revision, and Sure Shot Questions that will come in your CBSE exams. This material has been strictly prepared on the latest 2026 syllabus for Class 11 Chemistry. Our expert teachers always suggest you to use these tools daily to make your learning easier and faster.

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