For an element with atomic number 19, the 19th electron will occupy

Options

A. L-shell
B. M-shell
C. N-shell
D. K-shell

Answer

To determine where the 19th electron of an element with atomic number 19 will occupy, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Atomic Number**: The atomic number of the element is given as 19. This means that the element has 19 electrons.

2. **Understand Electron Shells**: Electrons are arranged in shells around the nucleus of an atom. The shells are designated as K, L, M, N, etc. Each shell has a maximum capacity for electrons:
- K shell can hold a maximum of 2 electrons.
- L shell can hold a maximum of 8 electrons.
- M shell can hold a maximum of 18 electrons, but for atomic numbers up to 20, we consider it can hold 8 electrons for simplicity.
- N shell can hold more than 8 electrons, but we will fill it according to the atomic number.

3. **Fill the K Shell**: The first shell (K) can hold 2 electrons. Therefore, we place 2 electrons in the K shell.
- Electrons in K shell = 2

4. **Fill the L Shell**: The second shell (L) can hold 8 electrons. We place 8 electrons in the L shell.
- Electrons in L shell = 8
- Total electrons so far = 2 (K) + 8 (L) = 10

5. **Fill the M Shell**: The third shell (M) can also hold 8 electrons. We place 8 electrons in the M shell.
- Electrons in M shell = 8
- Total electrons so far = 10 (K + L) + 8 (M) = 18

6. **Determine the 19th Electron**: After filling the K, L, and M shells, we have placed 18 electrons. The 19th electron will now occupy the next available shell, which is the N shell.
- Electrons in N shell = 1 (the 19th electron)

### Conclusion:
For an element with atomic number 19, the 19th electron will occupy the N shell.

### Final Answer:
The 19th electron will occupy the N shell.

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