Which of the following options does not represent ground state electronic configuration of an atom?

Options

A. `1s^(2)2s^(2)2p^(6)3s^(2)3d^(8)4s^(2)`
B. `1s^(2) 2s^(2)2p^(6)3s^(2)3p^(6)3d^(9)4s^(2)`
C. `1s^(2)2s^(2)2p^(6)3d^(10)4s^(1)`
D. `1s^(2)2s^(2)2p^(6)3s^(2)3p^(6)3d^(5)4s^(1)`

Explanation

To determine which of the given electronic configurations does not represent the ground state electronic configuration of an atom, we will analyze each option step by step.

### Step-by-Step Solution:

1. **Understanding Ground State Configuration**:
- The ground state electronic configuration of an atom is the arrangement of electrons in the lowest energy levels. Electrons fill orbitals in a specific order based on the Aufbau principle, Hund's rule, and the Pauli exclusion principle.

2. **Analyzing Each Option**:
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