MEDIUM
11th CBSE
IMPORTANT
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Why do elements in the same group have similar physical and chemical properties?

Important Questions on Classification of Elements and Periodicity in Properties

MEDIUM
11th CBSE
IMPORTANT
Textbook for Class XI Chemistry Part I>Chapter 3 - Classification of Elements and Periodicity in Properties>EXERCISES>Q 3.9
What does the atomic radius and ionic radius really mean to you?
MEDIUM
11th CBSE
IMPORTANT
Textbook for Class XI Chemistry Part I>Chapter 3 - Classification of Elements and Periodicity in Properties>EXERCISES>Q 3.1
How does atomic radius vary in a period and in a group? How do you explain the variation?
EASY
11th CBSE
IMPORTANT
Textbook for Class XI Chemistry Part I>Chapter 3 - Classification of Elements and Periodicity in Properties>EXERCISES>Q 3.11
What do you understand by isoelectronic species? Name a species that will be isoelectronic with each of the following atoms or ions.
(i)  F- (ii) Ar (iii) Mg2+ (iv) Rb+
EASY
11th CBSE
IMPORTANT
Textbook for Class XI Chemistry Part I>Chapter 3 - Classification of Elements and Periodicity in Properties>EXERCISES>Q 3.12

Consider the following species :

N3-, O2-, F-, Na+, Mg2+ and Al3+ 

What is common in them?

HARD
11th CBSE
IMPORTANT
Textbook for Class XI Chemistry Part I>Chapter 3 - Classification of Elements and Periodicity in Properties>EXERCISES>Q 3.12

Consider the following species :

N3-, O2-, F-, Na+, Mg2+ and Al3+ 

Arrange them in the order of increasing ionic radii.

EASY
11th CBSE
IMPORTANT
Textbook for Class XI Chemistry Part I>Chapter 3 - Classification of Elements and Periodicity in Properties>EXERCISES>Q 3.13
Explain why cations are smaller and anions larger in radii than their parent atoms?
MEDIUM
11th CBSE
IMPORTANT
Textbook for Class XI Chemistry Part I>Chapter 3 - Classification of Elements and Periodicity in Properties>EXERCISES>Q 3.14

What is the significance of the terms — ‘isolated gaseous atom’ and ‘ground state’ while defining the ionization enthalpy and electron gain enthalpy?

Hint: Requirements for comparison purposes.

MEDIUM
11th CBSE
IMPORTANT
Textbook for Class XI Chemistry Part I>Chapter 3 - Classification of Elements and Periodicity in Properties>EXERCISES>Q 3.15
Energy of an electron in the ground state of the hydrogen atom is -2.18×10-18J. Calculate the ionization enthalpy of atomic hydrogen in terms of J mol‐1.