What type of hydridisation is involveed in the formation of pentahalides is involved in the formation of pentahalides of group 15 elements?

Explanation

To determine the type of hybridization involved in the formation of pentahalides of group 15 elements, we can follow these steps:

### Step-by-Step Solution:

1. **Identify Group 15 Elements**:
The elements in Group 15 of the periodic table include nitrogen (N), phosphorus (P), arsenic (As), antimony (Sb), and bismuth (Bi).

2. **Understand Pentahalides**:
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