The VA group element having more number of allotropes is

Options

A. N
B. P
C. Bi
D. Sb

Answer

To determine which VA group element has the most allotropes, we will analyze each of the given options: nitrogen, phosphorus, bismuth, and antimony.

### Step-by-Step Solution:

1. **Identify the Elements in the VA Group:**
The VA group, also known as Group 15 of the periodic table, includes nitrogen (N), phosphorus (P), arsenic (As), antimony (Sb), and bismuth (Bi).

2. **Examine Nitrogen:**
- Nitrogen (N) does not have allotropes. The reason for this is its small atomic size and high electronegativity, which prevent the formation of different structural forms.

3. **Examine Phosphorus:**
- Phosphorus (P) has multiple allotropes. The most common allotropes include:
- White phosphorus
- Red phosphorus
- Black phosphorus
- Violet phosphorus
- Scarlet phosphorus
- In total, phosphorus has more than 10 known allotropes, making it the element with the highest number of allotropes in this group.

4. **Examine Antimony:**
- Antimony (Sb) has three allotropes. These allotropes are:
- Yellow antimony
- Black antimony
- Metallic antimony
- While it does have allotropes, the number is significantly lower than that of phosphorus.

5. **Examine Bismuth:**
- Bismuth (Bi) does not have stable allotropes. Any forms that may exist are considered unstable and not recognized as distinct allotropes.

6. **Conclusion:**
- Comparing the number of allotropes:
- Nitrogen: 0 allotropes
- Phosphorus: >10 allotropes
- Antimony: 3 allotropes
- Bismuth: 0 stable allotropes
- The element with the most allotropes is phosphorus.

### Final Answer:
The VA group element having the most number of allotropes is **phosphorus (P)**.