Of the following pairs, the one containing examples of metalloid elements is:

Options

A. `B` and `AI`
B. `Ga` and `Ge`
C. `AI` and `Si`
D. `As` and `Sb`

Explanation

To determine which pair contains examples of metalloid elements, we can follow these steps:

### Step 1: Understand the Definition of Metalloids
Metalloids are elements that have properties intermediate between metals and non-metals. Common examples of metalloids include boron (B), silicon (Si), germanium (Ge), arsenic (As), antimony (Sb), and tellurium (Te).

### Step 2: Analyze Each Pair
We will analyze the provided pairs to identify which ones contain metalloids.

1. **First Pair: Aluminium and Silicon**
- Aluminium (Al) is a metal.
- Silicon (Si) is a metalloid.
- This pair contains one metalloid.

2. **Second Pair: Germanium and Gallium**
- Germanium (Ge) is a metalloid.
- Gallium (Ga) is a metal.
- This pair contains one metalloid.

3. **Third Pair: Arsenic and Antimony**
- Arsenic (As) is a metalloid.
- Antimony (Sb) is also a metalloid.
- This pair contains two metalloids.

4. **Fourth Pair: Sodium and Chlorine**
- Sodium (Na) is a metal.
- Chlorine (Cl) is a non-metal.
- This pair contains no metalloids.

### Step 3: Identify the Correct Pair
From the analysis:
- The first pair has one metalloid.
- The second pair has one metalloid.
- The third pair has two metalloids.
- The fourth pair has none.

The pair that contains only metalloids is **Arsenic and Antimony**.

### Conclusion
The correct answer is the pair containing **Arsenic (As) and Antimony (Sb)**.

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