What is the ratio by number of atoms in a molecule of ammonia ?

Explanation

To find the ratio by number of atoms in a molecule of ammonia (NH₃), we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Composition of Ammonia**:
- Ammonia (NH₃) is made up of nitrogen (N) and hydrogen (H) atoms.

2. **Count the Atoms in One Molecule of Ammonia**:
...