Number of s-block elements are:

Options

A. More than that of p-block elements
B. Equal to that of p-block elements
C. More than that of d-block elements
D. None of the above

Answer

To determine the number of s-block elements, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Groups of s-block Elements**:
The s-block elements are found in Group 1 (alkali metals) and Group 2 (alkaline earth metals) of the periodic table.

2. **Count the Number of Groups in the s-block**:
There are 2 groups in the s-block: Group 1 and Group 2.

3. **Identify the Periods of s-block Elements**:
The s-block elements span across 7 periods in the periodic table.

4. **Calculate the Total Number of s-block Elements**:
Each group in the s-block contains 2 elements (one from each period), leading to:
\[ \text{Total s-block elements} = \text{Number of groups} \times \text{Number of periods} = 2 \times 7 = 14 \]

5. **Compare with Other Blocks**:
- **P-block Elements**: The p-block consists of Groups 13 to 18, which totals 6 groups. Since there are 6 periods, the total number of p-block elements is:
\[ 6 \text{ groups} \times 6 \text{ periods} = 36 \text{ elements} \]
- **D-block Elements**: The d-block consists of Groups 3 to 12, which totals 10 groups. With 4 periods, the total number of d-block elements is:
\[ 10 \text{ groups} \times 4 \text{ periods} = 40 \text{ elements} \]

6. **Final Comparison**:
- S-block elements: 14
- P-block elements: 36
- D-block elements: 40

7. **Conclusion**:
The number of s-block elements (14) is less than both the number of p-block elements (36) and d-block elements (40). Therefore, the correct answer is that the number of s-block elements is "none of the above" from the given options.

### Final Answer:
The number of s-block elements is 14, and the correct option is D: none of the above.

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