What is the state of hybridisation of nitrogen in `NH_4^(+)` ion?

Explanation

To determine the state of hybridization of nitrogen in the \( NH_4^+ \) ion, we can follow these steps:

### Step 1: Identify the central atom
The central atom in the \( NH_4^+ \) ion is nitrogen (N).

### Step 2: Count the number of valence electrons
Nitrogen has 5 valence electrons. In the \( NH_4^+ \) ion, we need to account for the positive charge, which means we have one less electron. Therefore, the total number of valence electrons for \( NH_4^+ \) is:
\[ 5 - 1 = 4 \text{ valence electrons} \]
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