Question

Elements of which atomic numbers belong to 3d transition series?

• A. 22 to 30
• B. 21 to 30
• C. 21 to 31
• D. 21 to 29

Hint:

The 3d transition series consists of elements with atomic numbers 21 through 30, starting from Scandium (21) to Zinc (30).

Answer 1

The Correct Option is B

Step 1: Understand the 3d transition series.
The 3d transition elements are those elements in which the last electron enters the 3d subshell. These elements are found in the transition metal block of the periodic table. The atomic numbers for the 3d transition series range from 21 to 30.
Step 2: Identify the atomic numbers.
- The elements that belong to the 3d transition series are Scandium (Sc) with atomic number 21, Titanium (Ti) with atomic number 22, and so on until Zinc (Zn) with atomic number 30.
Step 3: Apply to the options.
The range of atomic numbers from 21 to 30 covers the complete 3d transition series. Therefore, the correct answer is (B).
Final Answer: \[ \boxed{\text{21 to 30}} \]