The element that does not belong to the same period of the remaining elements (modern periodic table) is:
Show Hint
- Palladium
- Iridium
- Osmium
- Platinum
The Correct Option is A
Solution and Explanation
The periodic table is organized into periods (rows) and groups (columns). Elements in the same period have the same number of electron shells but differ in the number of valence electrons.
Let's analyze the elements:
Palladium (Pd) has an atomic number of 46 and belongs to the 5th period of the periodic table.
Iridium (Ir) has an atomic number of 77 and belongs to the 6th period of the periodic table.
Osmium (Os) has an atomic number of 76 and belongs to the 6th period of the periodic table.
Platinum (Pt) has an atomic number of 78 and belongs to the 6th period of the periodic table.
Thus, Palladium is the only element that belongs to the 5th period, while Iridium, Osmium, and Platinum belong to the 6th period.
Therefore, the correct answer is Palladium (option 1), as it does not belong to the same period as the other three elements.
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