Periodic Classification Of Elements

4 Questions
  1. 1
    Consider the following statements :
    1. Statement I : Some rare earth elements are used in the manufacture of flat television screens and computer monitors.
    2. Statement II : Some rare earth elements have phosphorescent properties.
    Which one of the following is correct in respect of the above statements?
    UPSC CSE I - 2025
  2. 2

    Which one of the following is also called Stranger Gas?

    UPSC CSE I - 2008
  3. 3

    Assertion (a) : In the periodic table of chemical elements, electron affinity is always found to increase from top to bottom in a group
    Reason (R): In a group, the atomic radii generally increase from top to bottom.

    UPSC CSE I - 2003
  4. 4

    Consider the following statements with reference to the periodic table of chemical elements:

    1. lonisation potential gradually decreases 'along a period.
    2. In a group of elements, electron affinity decreases as the atomic weight increases.
    3. In a given period, electronegativity decreases as the atomic number increases.

    Which of these statements(s) is/are correct?'

    UPSC CSE I - 2001