The first ionization enthalpy `(Delta_(t)H)` values of the third period elements, `Na, Mg` and `Si` are respectively 496, 737 and `786 kJ mol^(-1)`. Predict whether the first `Delta_(t)H` valye for Al will be more close to 575 or `760 kJ mol^(-1)`? Justify your answer.

Explanation

To predict whether the first ionization enthalpy (ΔtH) value for Aluminium (Al) will be closer to 575 kJ/mol or 760 kJ/mol, we need to analyze the electronic configurations of the elements involved and their corresponding ionization enthalpy values.

### Step-by-Step Solution:

1. **Identify the Electronic Configurations**:
- Sodium (Na): 1s² 2s² 2p⁶ 3s¹
- Magnesium (Mg): 1s² 2s² 2p⁶ 3s²
- Silicon (Si): 1s² 2s² 2p⁶ 3s² 3p²
...