Classify the elements having atomic numbers `(9,12,16,34,53,56)` into three separate pairs on the basis of similar chemical properties.

Explanation

To classify the elements with atomic numbers 9, 12, 16, 34, 53, and 56 into pairs based on their similar chemical properties, we will follow these steps:

### Step 1: Identify the Elements
First, we need to identify the elements corresponding to the given atomic numbers:
- Atomic number 9: Fluorine (F)
- Atomic number 12: Magnesium (Mg)
- Atomic number 16: Sulfur (S)
- Atomic number 34: Selenium (Se)
...