Which of the following strtement is /are correct ?

Options

A. The electeron configuration of `Cr` is `[Ar]3d^(5) 4s^(1) ("atomic number of" Cr = 24)`
B. The magnitic quantum number may have a negative value
C. In silver atom `23` electron have spin of one type and `24` of the opposite type (atomic number of `Ag = 47)`
D. The oxidation state of nitrogen in `HN_(3)` is `-3`

Explanation

To determine which statements are correct, we will analyze each statement one by one.

### Step-by-Step Solution:

1. **Statement 1: The electronic configuration of Cr is [Ar] 3d^5 4s^1.**
- Chromium (Cr) has an atomic number of 24. The correct electronic configuration for Cr is [Ar] 3d^5 4s^1. This configuration is indeed correct because chromium is an exception to the expected filling order due to its stability when the 3d and 4s orbitals are half-filled.
- **Conclusion:** This statement is correct.

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