For elements `""_19^39X`
Write electronic configuration

Explanation

To write the electronic configuration for the element represented as \( _{19}^{39}X \), we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Atomic Number and Mass Number**:
- The atomic number (Z) is 19, which indicates the number of protons in the element.
- The mass number (A) is 39, which is the total number of protons and neutrons in the nucleus.

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