CBSE  /  Class 11  /  Chemistry  /  Classification of Elements and Periodicity in Properties

  • 1. 
    Arrange S, O and Se in ascending order of electron affinity

  • Se < S < O
  • Se < O < S
  • S < O < Se
  • S < Se < O

  • 2. 
    In the modern periodic table , the period indicates the value of:

  • Atomic Number
  • Atomic Mass
  • Principal Quantum Number
  • Azimuthal Quantum Number

  • 3. 
    The electronic configuration of an element is 1s², 2s² 2p, 3s² 3p³. What is the atomic number of the element which is just below the above element in the periodic table

  • 31
  • 34
  • 33
  • 49

  • 4. 
    The reduction in atomic size with increase in atomic number is a characteristic of elements of-

  • d−block
  • f−block
  • Radioactive series
  • High atomic masses

  • 5. 
    The number of elements in the 5th period of the periodic table is

  • 3
  • 9
  • 8
  • 18

  • 6. 
    The electronic configuration of halogen is

  • ns² np
  • ns² np
  • ns² np
  • ns²

  • 7. 

  • 8. 
    Which of the following forms the most stable gaseous negative ion?

  • F
  • Cl
  • Br
  • I

  • 9. 
    On the Paulings electro negativity scale the element next to F is

  • N
  • Cl
  • O
  • Ne.

  • 10. 
    The element californium belongs to a family of :

  • Alkali metal family
  • Actinide series
  • Alkaline earth family
  • Lanthanide series
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