Question

Identify false statement about transition elements.

• A. As per IUPAC convention, transition metal atom have incomplete d-subshell.
• B. 6d-series includes all elements from $\text{Ac}(Z = 89)$ to $\text{Cn}(Z = 112)$.
• C. These elements are placed in group 3 to 12 in modern periodic table.
• D. In these $(n-1)$ d-orbital is filled successively.

Hint:

Key: Transition element $\neq$ always incomplete d in atom (check ions)

Answer 1

The Correct Option is A

Concept: Transition elements are defined as elements having partially filled d-orbitals in their atom or in common oxidation states.

Step 1: Analyze statements.
• (A) Incorrect: Some atoms may have filled d-subshell but still show transition behavior in ions.
• (B) Correct: 6d series spans from Ac to Cn
• (C) Correct: Located in groups 3–12
• (D) Correct: $(n-1)d$ orbitals are filled

Step 2: Conclusion.
Thus, statement (A) is false. Final Answer: Option (A)