Atomic number of a few elements are given below 10, 20, 7, 14
Determine the valency of these elements.

Explanation

To determine the valency of the elements with atomic numbers 10, 20, 7, and 14, we will follow these steps:

### Step 1: Identify the Atomic Numbers
The atomic numbers given are:
- Atomic number 10
- Atomic number 20
- Atomic number 7
- Atomic number 14
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