Which of the following sets of elements are called Pnicogens?

Options

A. Fe, Co, Ni
B. N, P, As
C. O, S, Se
D. Cu, Ag, Au

Answer

To determine which of the following sets of elements are called Pnicogens, we need to identify the elements that belong to Group 15 of the periodic table, also known as the nitrogen family or Pnicogens.

### Step-by-Step Solution:

1. **Understand the term "Pnicogens":**
- Pnicogens refer to the elements in Group 15 of the periodic table. This group includes Nitrogen (N), Phosphorus (P), Arsenic (As), Antimony (Sb), Bismuth (Bi), and Moscovium (Mc).

2. **Identify the elements from the options provided:**
- The options given are:
- A) Fe, Co, Ni
- B) N, P, As
- C) O, S
- D) Fe, Cu, Ag, Au

3. **Analyze each option:**
- **Option A (Fe, Co, Ni):** These are transition metals and do not belong to Group 15.
- **Option B (N, P, As):** These elements are Nitrogen, Phosphorus, and Arsenic, which are all part of Group 15 (Pnicogens).
- **Option C (O, S):** These elements belong to Group 16 and are not Pnicogens.
- **Option D (Fe, Cu, Ag, Au):** These are also transition metals and do not belong to Group 15.

4. **Conclusion:**
- The correct answer is **Option B (N, P, As)**, as these elements are classified as Pnicogens.

### Final Answer:
The elements that are called Pnicogens are Nitrogen (N), Phosphorus (P), and Arsenic (As).

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