The electronic configuration of an element is `1s^(2)2s^(2)2p^(6)3s^(2)3p^(3)`. The atomic number of the element which is just below the above element in the periodic table is

Options

A. 49
B. 31
C. 34
D. 33

Answer

To solve the question, we need to determine the atomic number of the element that is directly below the given element in the periodic table based on the provided electronic configuration.

### Step-by-Step Solution:

1. **Identify the Electronic Configuration**:
The given electronic configuration is `1s^(2)2s^(2)2p^(6)3s^(2)3p^(3)`.

2. **Count the Total Electrons**:
We need to count the total number of electrons represented in the configuration:
- `1s^(2)` contributes 2 electrons
- `2s^(2)` contributes 2 electrons
- `2p^(6)` contributes 6 electrons
- `3s^(2)` contributes 2 electrons
- `3p^(3)` contributes 3 electrons

Adding these together:
\[ 2 + 2 + 6 + 2 + 3 = 15 \]
Thus, the total number of electrons is 15.

3. **Determine the Element**:
The atomic number is equal to the number of electrons in a neutral atom. Therefore, the element with atomic number 15 is phosphorus (P).

4. **Find the Element Below Phosphorus**:
In the periodic table, phosphorus is located in group 15 (or group V). The element directly below phosphorus in the same group is arsenic (As).

5. **Determine the Atomic Number of Arsenic**:
The atomic number of arsenic is 33.

### Final Answer:
The atomic number of the element which is just below phosphorus in the periodic table is **33**.

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