Question:
Which from following is a transition element and also included as post actinoid element?
Which from following is a transition element and also included as post actinoid element?
Show Hint
Post actinoid elements have atomic number above 103; rutherfordium is the first of them.
Updated On: Nov 13, 2026
Rf
Lu
Cd
Hf
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The Correct Option is A
Solution and Explanation
Step 1: Understanding the Concept
Post actinoid elements are those after lawrencium (Z = 103), with Z = 104 onwards, filling the 6d series.
Step 2: Check options
Rf has Z = 104 and is a 6d transition element.\nLu is a lanthanoid, Cd is a 4d element and Hf (Z = 72) is a 5d element, not post actinoid.
Final Answer:
Rf is a transition element and a post actinoid element. \[ \boxed{\text{(A) }\text{Rf}} \]
Post actinoid elements are those after lawrencium (Z = 103), with Z = 104 onwards, filling the 6d series.
Step 2: Check options
Rf has Z = 104 and is a 6d transition element.\nLu is a lanthanoid, Cd is a 4d element and Hf (Z = 72) is a 5d element, not post actinoid.
Final Answer:
Rf is a transition element and a post actinoid element. \[ \boxed{\text{(A) }\text{Rf}} \]
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