Question

What is the total number of transition series of d-block elements?

• A. \(3\)
• B. \(4\)
• C. \(10\)
• D. \(12\)

Hint:

The d-block contains the 3d, 4d, 5d and 6d series.

Answer 1

The Correct Option is B

Step 1: Understanding the Concept:
A transition series is a row of the d-block in which a \(d\) subshell is being filled. Each row has up to \(10\) elements.

Step 2: Key Formula or Approach:
The d-block covers the \(3d\) (Sc to Zn), \(4d\) (Y to Cd), \(5d\) (La, Hf to Hg) and \(6d\) (Ac, Rf to Cn) series.

Step 3: Detailed Explanation:
These are the first, second, third and fourth transition series: periods \(4\), \(5\), \(6\) and \(7\).
So the total number of d-block series is \(4\).
The number \(10\) is the number of elements in one full series, not the number of series.

Final Answer:
The d-block has \(4\) transition series, option (B). \[ \boxed{4} \]