The number of electrons in the L-shell of the element with atomic number 15 is :-

Options

A. 8
B. 6
C. 10
D. 12

Answer

To find the number of electrons in the L-shell of the element with atomic number 15, we can follow these steps:

### Step 1: Identify the Element
The element with atomic number 15 is phosphorus (P).

### Step 2: Write the Electronic Configuration
The electronic configuration of phosphorus can be determined by filling the orbitals according to the Aufbau principle. The configuration is:
- 1s²
- 2s²
- 2p⁶
- 3s²
- 3p³

So, the complete electronic configuration for phosphorus is:
1s² 2s² 2p⁶ 3s² 3p³.

### Step 3: Determine the Shells
In the electronic configuration:
- The **K-shell** corresponds to the 1s orbital.
- The **L-shell** corresponds to the 2s and 2p orbitals.
- The **M-shell** corresponds to the 3s and 3p orbitals.

### Step 4: Count the Electrons in the L-shell
To find the number of electrons in the L-shell, we sum the electrons in the 2s and 2p orbitals:
- 2s has 2 electrons.
- 2p has 6 electrons.

So, the total number of electrons in the L-shell is:
2 (from 2s) + 6 (from 2p) = 8 electrons.

### Conclusion
The number of electrons in the L-shell of the element with atomic number 15 (phosphorus) is **8**.

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