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 the metallic and non-metallic elements that are liquid at room temperature, we can follow these steps:

### Step 1: Identify Liquid Elements at Room Temperature
At room temperature (approximately 25°C), there are only two elements that exist in a liquid state: mercury (Hg) and bromine (Br).

### Step 2: Determine the Metallic Element
Among the liquid elements, mercury is the only metallic element. It is a unique metal that remains liquid at room temperature.

### Step 3: Find the Atomic Number of Mercury
The atomic number of mercury (Hg) is 80.

### Step 4: Determine the Non-Metallic Element
The other liquid element, bromine, is a non-metal.

### Step 5: Find the Atomic Number of Bromine
The atomic number of bromine (Br) is 35.

### Step 6: Combine the Findings
Thus, the atomic numbers of the metallic and non-metallic elements that are liquid at room temperature are:
- Mercury (metal): Atomic number 80
- Bromine (non-metal): Atomic number 35

### 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.

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