Question:
Total number of elements are in d-block is __________.
Total number of elements are in d-block is __________.
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Each transition series contains 10 elements because d-subshell can hold a maximum of 10 electrons.
Updated On: Apr 19, 2026
- 39
- 40
- 38
- 36
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The Correct Option is B
Solution and Explanation
Concept:
The d-block elements are those in which the last electron enters the \( (n-1)d \) subshell. These elements are also called transition elements and are located in the middle of the periodic table.
Counting d-block Elements: The d-block consists of four transition series:
3d series: Sc (21) to Zn (30) → 10 elements
4d series: Y (39) to Cd (48) → 10 elements
5d series: Hf (72) to Hg (80) → 10 elements
6d series: Rf (104) to Cn (112) → 10 elements
Total Number: \[ 10 + 10 + 10 + 10 = 40 \] \[ \boxed{40} \]
Counting d-block Elements: The d-block consists of four transition series:
3d series: Sc (21) to Zn (30) → 10 elements
4d series: Y (39) to Cd (48) → 10 elements
5d series: Hf (72) to Hg (80) → 10 elements
6d series: Rf (104) to Cn (112) → 10 elements
Total Number: \[ 10 + 10 + 10 + 10 = 40 \] \[ \boxed{40} \]
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