Question:
Identify the element, which does not belong to the fifth period of the long form of periodic table.
Identify the element, which does not belong to the fifth period of the long form of periodic table.
Show Hint
The important transition elements of the fifth period are
\[
\boxed{\mathrm{Y}\rightarrow\mathrm{Cd}.}
\]
Platinum (\(\mathrm{Pt}\)) belongs to the
\[
\boxed{\text{6th period}.}
\]
Updated On: Jul 18, 2026
- Pd
- Pt
- Cd
- Ag
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Verified By Collegedunia
The Correct Option is B
Solution and Explanation
Step 1: Identify the period of each element.& nbsp;
The given elements belong to the following periods:
\[ \begin{aligned} \mathrm{Pd} & amp;\rightarrow \text{5th period},\\ \mathrm{Cd} & amp;\rightarrow \text{5th period},\\ \mathrm{Ag} & amp;\rightarrow \text{5th period},\\ \mathrm{Pt} & amp;\rightarrow \text{6th period}. \end{aligned} \]
Step 2: Identify the element that does not belong to the fifth period.
Among the given elements, only platinum belongs to the sixth period.
Hence,
\[ \boxed{\mathrm{Pt}} \]
does not belong to the fifth period.
Therefore, the correct option is \[ \boxed{(B)}. \]
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