With increase in n, ionisation energy will increase or decrease ?

Explanation

To determine how ionization energy changes with an increase in the principal quantum number \( n \), we can follow these steps:

### Step 1: Understand Ionization Energy
Ionization energy is the energy required to remove an electron from an atom or ion. It is a measure of how strongly an electron is bound to the nucleus.

### Step 2: Use the Formula for Energy Levels
The energy levels of an electron in a hydrogen-like atom can be expressed using the formula:
\[
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