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JEE Advanced levelSingle correct optionDifficulty 3 of 3pt004

How many d-block elements (counting Zn and Cd as d-block) are there among elements with atomic numbers 1 to 54?

  1. A20
  2. B10
  3. C18
  4. D24

Answer: A

The 3d series (Z = 21-30) has 10 elements and the 4d series (Z = 39-48) has 10 elements. The total is . The 24 p-block elements and 10 s-block elements are not included.
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