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Periodic Table and Periodicity question

2025 · 23 Jan · Shift 1 · Q16
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Periodic Table and Periodicity question

2025 · 23 Jan · Shift 1 · Q16

JEE MainChemistryPeriodic Table and PeriodicityMCQ+4 / −1
The element that does not belong to the same period of the remaining elements (modern periodic table) is:
  1. A
    Platinum
  2. B
    Osmium
  3. C
    Iridium
  4. D
    Palladium
View written solutionFree

Correct answer: D

  1. Identify the periods of each element in the modern periodic table

    We check the atomic numbers / positions of the given elements:

    • Platinum (Pt): atomic number 787878 → Period 6
    • Osmium (Os): atomic number 767676 → Period 6
    • Iridium (Ir): atomic number 777777 → Period 6
    • Palladium (Pd): atomic number 464646 → Period 5

  2. Compare the periods

    • Pt, Os, and Ir all belong to Period 6.
    • Pd belongs to Period 5.

  3. Find the odd one out

    Since Palladium is the only element not in the same period as the others, it does not belong to the same period.

  4. Check options

    • A: Platinum — same period as Os and Ir
    • B: Osmium — same period as Pt and Ir
    • C: Iridium — same period as Pt and Os
    • D: Palladium — different period

Therefore, the correct answer is:

D: Palladium\boxed{\text{D: Palladium}}D: Palladium​

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