Maximum number of electrons in first orbit may be

Options

A. 2
B. 1
C. 8
D. 16

Answer

To determine the maximum number of electrons in the first orbit (K-shell), we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Electron Shells:**
- Electrons are arranged in orbits or shells around the nucleus of an atom. These shells are designated as K, L, M, N, etc.

2. **Identifying the First Shell:**
- The first shell is known as the K-shell. It is the closest shell to the nucleus.

3. **Maximum Electron Capacity Formula:**
- The maximum number of electrons that can occupy a shell is given by the formula:
\[ \text{Maximum electrons} = 2n^2 \]
- Here, \( n \) is the principal quantum number corresponding to the shell. For the K-shell, \( n = 1 \).

4. **Calculating for K-shell:**
- Substituting \( n = 1 \) into the formula:
\[ \text{Maximum electrons} = 2(1^2) = 2 \text{ electrons} \]

5. **Conclusion:**
- Therefore, the maximum number of electrons that can occupy the first orbit (K-shell) is 2.

### Final Answer:
The maximum number of electrons in the first orbit (K-shell) may be **2**.

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