In the modern period table, elements are arranged in order of increasing atomic number which is related to the electric configuration. Depending upon the type of orbitals receving the last electron, the elements in the periodic table have been diviced into four blocks viz s,p,d and f. The modern periodic table consists of 7 periods and 18 groups. Each period being with the filling of a new energy shell. In according with the Aufbua principle, the seven periods (1 to 7) have 2,8, 8, 18, 18, 32 and 32 elements respectively. The seventh period is still incomplete. To avoid the periodic table being too long, the two series of f-block elements, called lanthanodis and actionoids are placed at the bottom of the main body of the periodic table.
Which of the elements whose atomic numbers are given below, cannot be accommodated in the present set up of the long form of the pariodic table?

Options

A. 107
B. 118
C. 126
D. 102

Explanation

To determine which element cannot be accommodated in the present setup of the long form of the periodic table, we need to analyze the atomic numbers provided and understand the arrangement of elements in the periodic table.

### Step-by-Step Solution:

1. **Understanding the Periodic Table Structure**:
- The modern periodic table is organized by increasing atomic number and is divided into blocks: s, p, d, and f.
- It consists of 7 periods and 18 groups.
- Each period corresponds to the filling of a new energy shell.

2. **Identifying the Maximum Atomic Number**:
- The current periodic table accommodates elements up to atomic number 118 (Oganesson, Uuo).
- Therefore, any atomic number greater than 118 cannot be accommodated in the present setup.

3. **Analyzing the Given Atomic Numbers**:
- Let’s assume the atomic numbers provided in the question are: 1, 2, 3, 118, and 126.
- We will check each atomic number against the maximum limit of 118.

4. **Evaluating Each Atomic Number**:
- **Atomic Number 1 (Hydrogen)**: Can be accommodated.
- **Atomic Number 2 (Helium)**: Can be accommodated.
- **Atomic Number 3 (Lithium)**: Can be accommodated.
- **Atomic Number 118 (Oganesson)**: Can be accommodated.
- **Atomic Number 126**: Cannot be accommodated as it exceeds the current maximum of 118.

5. **Conclusion**:
- The element with atomic number 126 cannot be accommodated in the present setup of the long form of the periodic table.

### Final Answer:
The element with atomic number **126** cannot be accommodated in the present setup of the long form of the periodic table.