For the electrons of oxygen atom, which of the following statements correct?

Options

A. `Z_(eff)` for an electron in a 2s orbital is the same as `Z_(eff)` for an electron in a 2p orbtial
B. An electron in the 2s orbtial has the same energy as an electron in the 2p orbital
C. `z_(eff)` for an electron in 1s orbital is the same as `z_(eff)` for an electron in a 2s orbital
D. The two electrons present in the 2s orbtial have spin quantum numbers `m_(s)` but of opposite sign.

Explanation

To determine which statement about the electrons of an oxygen atom is correct, we will analyze each option based on our understanding of atomic structure and quantum mechanics.

### Step-by-Step Solution:

1. **Understanding the Oxygen Atom Configuration**:
- An oxygen atom has 8 electrons. The electron configuration is 1s² 2s² 2p⁴. This means there are 2 electrons in the 1s orbital, 2 electrons in the 2s orbital, and 4 electrons in the 2p orbital.

2. **Analyzing Option 1**:
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