HARD
11th CBSE
IMPORTANT
Earn 100

Explain why the electron gain enthalpy of fluorine is less negative than that of chlorine.

Important Questions on Classification of Elements and Periodicity in Properties

MEDIUM
11th CBSE
IMPORTANT
NCERT Exemplar Chemistry - Class 11>Chapter 3 - Classification of Elements and Periodicity in Properties>Short Answer Type>Q 25
All transition elements are d-block elements, but all d-block elements are not transition elements. Explain.
MEDIUM
11th CBSE
IMPORTANT
NCERT Exemplar Chemistry - Class 11>Chapter 3 - Classification of Elements and Periodicity in Properties>Short Answer Type>Q 26
Identify the group and valency of the element having the atomic number 119. Also, predict the outermost electronic configuration and write the general formula of its oxide.  
MEDIUM
11th CBSE
IMPORTANT
NCERT Exemplar Chemistry - Class 11>Chapter 3 - Classification of Elements and Periodicity in Properties>Short Answer Type>Q 27

Ionisation enthalpies of elements of the second period are given below
Ionisation enthalpy /k cal mol-1  520,899,801,1086,1402,1314,1681, 2080. 

Match the correct enthalpy with the elements and complete the graph given in the figure. Also, write symbols of elements with their atomic number.

Question Image 

MEDIUM
11th CBSE
IMPORTANT
NCERT Exemplar Chemistry - Class 11>Chapter 3 - Classification of Elements and Periodicity in Properties>Short Answer Type>Q 28
Among the elements B, Al, C and Si, which element has the highest first ionisation enthalpy?
MEDIUM
11th CBSE
IMPORTANT
NCERT Exemplar Chemistry - Class 11>Chapter 3 - Classification of Elements and Periodicity in Properties>Short Answer Type>Q 28
Among the elements B, Al, C and Si, which element has the most metallic character? Justify your answer in each case.
MEDIUM
11th CBSE
IMPORTANT
NCERT Exemplar Chemistry - Class 11>Chapter 3 - Classification of Elements and Periodicity in Properties>Short Answer Type>Q 29
Write four characteristic properties of p-block elements.
MEDIUM
11th CBSE
IMPORTANT
NCERT Exemplar Chemistry - Class 11>Chapter 3 - Classification of Elements and Periodicity in Properties>Short Answer Type>Q 30
Choose the correct order of atomic radii of fluorine and neon (in pm) out of the options given below and justify your answer.
HARD
11th CBSE
IMPORTANT
NCERT Exemplar Chemistry - Class 11>Chapter 3 - Classification of Elements and Periodicity in Properties>Short Answer Type>Q 31
Illustrate by taking examples of transition elements and non-transition elements that oxidation states of elements are largely based on electronic configuration.