Question

Identify inner transition element from following.

• A. Hf
• B. Mo
• C. No
• D. Zr

Hint:

Inner transition elements are the lanthanoids and actinoids, filling the 4f and 5f subshells.

Answer 1

The Correct Option is C

Step 1: Atomic numbers
Actinoids span Z = 90 to 103, so No with Z = 102 is an actinoid.

Step 2: Others
Hf (72), Mo (42), Zr (40) lie in the d-block.

Final Answer:
Option (C), No. \[ \boxed{\text{(C) }\text{No}} \]