The atomic numbers of the metallic and non-metallic elements which are liquid at room temperature respectively are:

Options

A. 55,87
B. 33,87
C. 35,80
D. 80,35

Answer

To solve the question regarding the atomic numbers of metallic and non-metallic elements that are liquid at room temperature, we can follow these steps:

### Step-by-Step Solution:

1. **Identify Liquid Elements at Room Temperature**:
- At room temperature (approximately 25°C), there are only a few elements that exist in a liquid state. The two notable ones are:
- Mercury (Hg) - a metallic element
- Bromine (Br) - a non-metallic element

2. **Determine the Atomic Numbers**:
- Next, we need to find the atomic numbers of these elements:
- **Mercury (Hg)**: The atomic number of mercury is **80**.
- **Bromine (Br)**: The atomic number of bromine is **35**.

3. **Present the Answer**:
- The question asks for the atomic numbers of the metallic and non-metallic elements that are liquid at room temperature, respectively. Therefore, we can summarize:
- Atomic number of metallic element (Mercury) = **80**
- Atomic number of non-metallic element (Bromine) = **35**

4. **Final Answer**:
- The atomic numbers of the metallic and non-metallic elements which are liquid at room temperature are **80** (for Mercury) and **35** (for Bromine), respectively.