NCERT Solutions For Class 11 Chemistry Chapter 3: Classification of Elements and Periodicity in Properties

NCERT Solutions for class 11 Chemistry Chapter 3 Classification of Elements and Periodicity in Properties are provided in this article. Some of the important topics in Classification of Elements and Periodicity in Properties chapter include:

Expected no. of questions: 2 to 4 questions of total 6 marks.

Download PDF: NCERT Solutions for Class 11 Chemistry Chapter 3 PDF

NCERT Solutions for Class 11 Chemistry Chapter 3

NCERT Solutions for Class 11 Chemistry Chapter 3 Classification of Elements and Periodicity in Properties is given below.

Class 11 Chemistry Chapter 3 Classification of Elements and Periodicity in Properties –Important Topics

Some of the classification of elements done by scientist before the origin of periodic table were as follows.

Dobereriener’s Triads: Three elements have same physical and chemical properties were grouped together and arranged in a form of an increasing atomic mass.
Newlands Law Of Octaves: This law states that whenever elements are arranged in ascending atomic masses, then the eighth and the first element will show the same property and this law is even similar to a musical note.
Mendeleev’s Periodic Table: This periodic table is arranged based on the increasing amount of atomic masses of elements.

According to modern periodic table, elements can be classified into four types.

S block Elements - They belong to Group 1 and 2 and have alkali metals and alkali earth metals.
P block Elements- They belong to Group 13-18 and contain representative and main group elements.
D block Elements - They belong to Group 3-12 and contain transition elements.
F block Elements - They are Lanthanides and actinides(4f and 5f) type of elements and are inner transition metals.

Periodic Trends in Properties of Elements is determined by:

Atomic Radius
Ionization Energy
Electronegativity
Valency
Metallic Characteristics of an Element
Non-metallic property of an Element
Reactivity of Element
Melting & Boiling Points of Element

Chapter Related Articles:

Ionization Enthalpy	Triads	Transuranium Elements
Electronic Configuration	Germanium	Anion
Moseley’s Law	Periodicity	Modern Periodic Table

Chemistry Related Articles:

NCERT Solutions for Class 11 Chemistry	Important Chemistry Formulas	Chemistry Study Material
Difference between Articles in Chemistry	Important Named Reactions	Chemistry Notes

CBSE CLASS XII Related Questions

1.
In an electrochemical cell, the following reaction takes place : $2\text{Cu}^{2+} (\text{aq}) + \text{Zn} (\text{s}) \rightarrow 2\text{Cu} (\text{s}) + \text{Zn}^{2+} (\text{aq})$
$E^\circ_{\text{cell}} = 1.28 \, \text{V}$
As the reaction progresses, what will happen to the overall voltage of the cell?
- Voltage will remain constant.
- It will decrease as $[\text{Zn}^{2+}]$ increases.
- It will increase as $[\text{Cu}^+]$ increases.
- It will increase as $[\text{Zn}^{2+}]$ increases.
View Solution
2.
Coordination number of Fe in $[Fe(C_2O_4)_3]^{3-}$ is :
- 6
- 3
- 4
- 5
View Solution
3.
Which of the following haloalkanes react with aqueous KOH most rapidly by $S_N1$ reaction?
- 2-Chlorobutane
- 1-Bromobutane
- 2-Bromo-2-Methylpropane
- 2,2-Dimethyl-1-Chloropropane
View Solution
4.
The primary and secondary valences of Co in [Co(en)₃]Cl₃ respectively are:
- 3, 3 \hspace{1cm}
- 0, 3
- 6, 3 \hspace{1cm}
- 3, 6
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5.
Alkyl halides undergoing nucleophilic bimolecular substitution reaction involve:
- retention of configuration
- formation of racemic mixture
- inversion of configuration
- formation of carbocation
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6.
According to Werner’s theory of coordination compounds:
- Primary valences are ionisable.
- Secondary valences are ionisable.
- Both primary and secondary valences are non-ionisable.
- Both primary and secondary valences are ionisable.
View Solution