Which one of the following statements is incorrect in relation to ionisation enthalpy?

Options

A. Ionization enthalpy increases for each successive electron.
B. The greatest increase in ionization enthalpy is experienced on removal of electron from core noble gas configuration.
C. End of valence electrons is marked by a big jump in ionization enthalpy.
D. Removal of electron from orbitals bearing lower n value is easier than from orbital having higher n value.

Explanation

To determine which statement is incorrect in relation to ionization enthalpy, we will analyze each of the four statements provided.

### Step-by-Step Solution:

1. **Understanding Ionization Enthalpy**:
- Ionization enthalpy (or ionization energy) is the energy required to remove an electron from an atom in the gas phase. It generally increases with the removal of successive electrons due to increased effective nuclear charge.

2. **Analyzing the Statements**:
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