Question:medium

The element that does not belong to the same period of the remaining elements (modern periodic table) is:

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When analyzing elements in the periodic table, always check their atomic number to determine their period. Elements in the same period have the same number of electron shells.
Updated On: Jan 14, 2026
  • Palladium
  • Iridium
  • Osmium
  • Platinum
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The Correct Option is A

Solution and Explanation

The objective is to identify the element that is not in the same period as the others on the modern periodic table. The provided elements are analyzed as follows:

  1. Palladium (Pd): Located in Period 5, Group 10.
  2. Iridium (Ir): Belongs to Period 6, Group 9.
  3. Osmium (Os): Situated in Period 6, Group 8.
  4. Platinum (Pt): Also in Period 6, Group 10.

Analysis reveals:

  • Iridium, Osmium, and Platinum are all in Period 6.
  • Palladium is in Period 5.

Consequently, Palladium (Pd) is the element in Period 5, making it distinct from the others.

Conclusion: Palladium is the element that does not share the same period as the other listed elements.

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