Which of the following `Na, Mg, Si` and `P` would have the greatest difference between the `IE_(1)` and `IE_(2)`?

Explanation

To determine which of the elements Na (sodium), Mg (magnesium), Si (silicon), and P (phosphorus) has the greatest difference between the first ionization energy (IE1) and the second ionization energy (IE2), we can follow these steps:

### Step 1: Understand Ionization Energy
Ionization energy is the energy required to remove an electron from an atom. The first ionization energy (IE1) is the energy needed to remove the first electron, while the second ionization energy (IE2) is the energy required to remove a second electron after the first has been removed.

### Step 2: Analyze the Electronic Configurations
- **Sodium (Na)**: Electronic configuration is \(1s^2 2s^2 2p^6 3s^1\).
- **Magnesium (Mg)**: Electronic configuration is \(1s^2 2s^2 2p^6 3s^2\).
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