Is the Dobereiner's law of triads applicable for phosphorus arsenic and antimony? Explain

Explanation

To determine if Dobereiner's law of triads is applicable for phosphorus, arsenic, and antimony, we need to follow these steps:

### Step-by-Step Solution:

1. **Understand Dobereiner's Law of Triads**:
- Dobereiner's law states that when three elements are grouped together (a triad), the atomic weight of the middle element is approximately equal to the average of the atomic weights of the other two elements.

2. **Identify the Elements and Their Atomic Weights**:
...