Find the atomic number of element belonging to `4th` period and `17th` group in Modern periodic table `:`

Options

A. 17
B. 25
C. 59
D. 35

Explanation

To find the atomic number of the element belonging to the 4th period and 17th group in the Modern Periodic Table, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Period and Group**:
- The question specifies that we need to find an element in the 4th period and 17th group of the Modern Periodic Table.

2. **Understand the Structure of the Periodic Table**:
- The Modern Periodic Table is organized into periods (horizontal rows) and groups (vertical columns). The 17th group is known as the halogen group.

3. **List the Elements in the 17th Group**:
- The elements in the 17th group (halogens) include:
- Fluorine (F) - Atomic number 9
- Chlorine (Cl) - Atomic number 17
- Bromine (Br) - Atomic number 35
- Iodine (I) - Atomic number 53
- Astatine (At) - Atomic number 85

4. **Locate the Element in the 4th Period**:
- From the list of halogens, we need to find which one is in the 4th period.
- The periods are as follows:
- 1st Period: H, He
- 2nd Period: Li, Be, B, C, N, O, F, Ne
- 3rd Period: Na, Mg, Al, Si, P, S, Cl, Ar
- 4th Period: K, Ca, Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Ga, Ge, As, Se, Br, Kr

5. **Identify the Element**:
- The element in the 4th period and 17th group is Bromine (Br).

6. **Determine the Atomic Number**:
- The atomic number of Bromine (Br) is 35.

### Final Answer:
The atomic number of the element belonging to the 4th period and 17th group is **35**.

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