Question:
Which of the following pairs of elements does NOT include transition elements?
Which of the following pairs of elements does NOT include transition elements?
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A transition element has a partly filled d subshell; tin is a p-block metal and promethium is an f-block element.
Updated On: Oct 1, 2026
- Mn and Ag
- Zr and Au
- Mo and Pt
- Sn and Pm
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The Correct Option is D
Solution and Explanation
Step 1: Understanding the Concept
Transition elements (d-block) have partly filled d orbitals in their atoms or in their common ions. They lie in groups 3 to 12 of the periodic table.
Step 2: Check the pairs
(A) Mn (group 7) and Ag (group 11) are both d-block elements.
(B) Zr (group 4) and Au (group 11) are both d-block elements.
(C) Mo (group 6) and Pt (group 10) are both d-block elements.
(D) Sn (group 14) is a p-block element. Pm (promethium) is a lanthanoid, an f-block element. Neither belongs to the d-block.
Step 3: Conclusion
The pair with no d-block element is Sn and Pm, option (D).
Final Answer:
Tin is a p-block metal and promethium is an f-block lanthanoid, so option (D) has no transition element. \[ \boxed{\text{Sn and Pm}} \]
Transition elements (d-block) have partly filled d orbitals in their atoms or in their common ions. They lie in groups 3 to 12 of the periodic table.
Step 2: Check the pairs
(A) Mn (group 7) and Ag (group 11) are both d-block elements.
(B) Zr (group 4) and Au (group 11) are both d-block elements.
(C) Mo (group 6) and Pt (group 10) are both d-block elements.
(D) Sn (group 14) is a p-block element. Pm (promethium) is a lanthanoid, an f-block element. Neither belongs to the d-block.
Step 3: Conclusion
The pair with no d-block element is Sn and Pm, option (D).
Final Answer:
Tin is a p-block metal and promethium is an f-block lanthanoid, so option (D) has no transition element. \[ \boxed{\text{Sn and Pm}} \]
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