The number of elements that can be accommodated in the present set up of the long form of the periodic table is (upto `7^(th)` period).

Options

A. `117`
B. `118`
C. `119`
D. `120`

Answer

To determine the number of elements that can be accommodated in the long form of the periodic table up to the 7th period, we can analyze the structure of the periodic table based on the blocks (s, p, d, and f) and the number of elements in each period.

### Step-by-Step Solution:

1. **Understanding the Periods**:
The periodic table is divided into periods, and each period corresponds to the filling of electron shells. The 7th period is the last period in the periodic table.

2. **Counting Elements in Each Block**:
- **s-block**: The s-block contains 2 elements (1 from Group 1 and 1 from Group 2).
- **p-block**: The p-block contains 6 elements (from Group 13 to Group 18).
- **d-block**: The d-block contains 10 elements (transition metals).
- **f-block**: The f-block contains 14 elements (lanthanides and actinides).

3. **Elements in Each Period**:
- **1st Period**: 2 elements (1s)
- **2nd Period**: 8 elements (2s + 2p)
- **3rd Period**: 8 elements (3s + 3p)
- **4th Period**: 18 elements (4s + 3d + 4p)
- **5th Period**: 18 elements (5s + 4d + 5p)
- **6th Period**: 32 elements (6s + 4f + 5d + 6p)
- **7th Period**: 32 elements (7s + 5f + 6d + 7p)

4. **Total Elements Calculation**:
Now, we can add the total number of elements from each period:
- 1st Period: 2
- 2nd Period: 8
- 3rd Period: 8
- 4th Period: 18
- 5th Period: 18
- 6th Period: 32
- 7th Period: 32

Total = 2 + 8 + 8 + 18 + 18 + 32 + 32 = 118 elements

5. **Conclusion**:
Therefore, the total number of elements that can be accommodated in the long form of the periodic table up to the 7th period is **118**.

### Final Answer:
The number of elements that can be accommodated in the present setup of the long form of the periodic table (up to the 7th period) is **118**.

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