From each set, choose the element with highest ionization enthalpy and explain your answer.
Mg,P,Ar

Explanation

To determine which element has the highest ionization enthalpy from the set Mg, P, and Ar, we can follow these steps:

### Step 1: Understand Ionization Enthalpy
Ionization enthalpy (or ionization energy) is the energy required to remove the most loosely bound electron from an isolated gaseous atom. Generally, the ionization energy increases across a period and decreases down a group in the periodic table.

### Step 2: Identify the Elements and Their Positions in the Periodic Table
- **Magnesium (Mg)**: Atomic number 12, located in Group 2 (alkaline earth metals), Period 3.
- **Phosphorus (P)**: Atomic number 15, located in Group 15 (p-block), Period 3.
...