CBSE  /  Class 10  /  Science  /  Periodic Classification of Elements

  • 1. 
    Which one of the following does not increase while moving down the group of the periodic table?

  • Atomic radius
  • Metallic character
  • Valence
  • Number of shells in an element.

  • 2. 
    On moving from left to right in a period in the periodic table, the size of the atom

  • increases
  • decreases
  • does not change appreciably
  • first decreases and then increases.

  • 3. 
    An atom of an element has the electronic configuration 2, 8, 2. To which group does it belong?

  • 4th group
  • 6th group
  • 3rd group
  • 2nd group

  • 4. 
    In modern periodic table, elements are arranged according to their

  • atomic weight
  • density
  • atomic number
  • melting point

  • 5. 
    In which group are inert elements placed? ‘

  • Group 8
  • Group 10
  • Group 1
  • Group 18

  • 6. 
    Which of the following sets of atomic number belong to that of alkali metals?

  • 1, 12, 30, 4, 62
  • 37, 19, 3, 55
  • 9, 17, 35, 53
  • 12, 20, 56, 88

  • 7. 
    The element with atomic number 14 is hard and forms acidic oxide and a covalent halide. To which of the following categories does the element belong?

  • Metal
  • Metalloid
  • Non-metal
  • Left-hand side element

  • 8. 
    The amount of energy released when one or more electrons is added to the neutral atom is

  • electron affinity
  • ionisation energy
  • electron negativity
  • atomicity

  • 9. 
    The valence shell of element A contains 3 electrons while the valence shell of element B contains 6 electrons. If A combines with B, the probable chemical formula of the compound is

  • AB
  • A
  • A
  • A

  • 10. 
    Arrange the following elements in the order of their increasing non-metallic character. Li, O, C, Be, F

  • F < O < C < Be < Li
  • Li < Be < C < O < F
  • F < O < C < Be < Li
  • F < O < Be < C < Li
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