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JEE Main · 2025 · 23 Jan 2025 · Shift 1 · Classification of Elements and Periodicity

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The element that does not belong to the same period of the remaining elements (modern periodic table) is:
  1. (A)Palladium✓ Correct
  2. (B)Iridium
  3. (C)Osmium
  4. (D)Platinum

Answer: (A)

Solution

Locating each element by atomic number and electronic configuration:

Palladium (, ) fills its subshell and belongs to Period 5.

Osmium (), Iridium () and Platinum () all have electrons filling the subshell and belong to Period 6.

Palladium is the element that does not share its period with the remaining three.

JEE Main · 2025 · 23 Jan 2025 · Shift 1 · Single correct option

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