An element having atomic number 19 and belongs to Alkali metals is ______

Options

A. Li
B. F
C. K
D. Cl

Explanation

To solve the question, "An element having atomic number 19 and belongs to Alkali metals is ______," we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Atomic Number**: The question states that the atomic number of the element is 19.

2. **Understand Alkali Metals**: Alkali metals are a group of elements in Group 1 of the periodic table. They include lithium (Li), sodium (Na), potassium (K), rubidium (Rb), cesium (Cs), and francium (Fr).

3. **List the Atomic Numbers of Alkali Metals**:
- Lithium (Li) - Atomic number 3
- Sodium (Na) - Atomic number 11
- Potassium (K) - Atomic number 19
- Rubidium (Rb) - Atomic number 37
- Cesium (Cs) - Atomic number 55
- Francium (Fr) - Atomic number 87

4. **Locate the Element with Atomic Number 19**: From the list above, we can see that the element with atomic number 19 is potassium (K).

5. **Conclusion**: Therefore, the element having atomic number 19 that belongs to alkali metals is **Potassium (K)**.

### Final Answer:
The element having atomic number 19 and belongs to Alkali metals is **Potassium (K)**.

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