The first `(IE_1)` and second `(IE_2)` ionisation enthalpies `("kJ mol"^(-1))` of a few elements designated by Roman numerals are shown below.
`{:(,,IE_(1),IF_(2)),(,I,2372,5251),(,III,900,1760):}` `{:(,,IE_(1),IE_(2)),(,II,520,7300),(,IV,1680,3380):}`
Which of the above element is likely to be:
a reactive non-metal

Explanation

To determine which of the given elements is likely to be a reactive non-metal based on their first (IE₁) and second (IE₂) ionization enthalpies, we can follow these steps:

### Step 1: Understand Ionization Enthalpy
Ionization enthalpy (or ionization energy) is the energy required to remove an electron from an atom in its gaseous state. A lower ionization energy indicates that an element can lose an electron more easily, while a higher ionization energy suggests that it is more difficult to remove an electron.

### Step 2: Analyze the Given Data
We have the following ionization enthalpies for four elements:

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