Find the valency if Chlorine.

Answer

To find the valency of chlorine, we can follow these steps:

### Step 1: Identify the Atomic Number
Chlorine has an atomic number of 17.

### Step 2: Write the Electronic Configuration
The electronic configuration of chlorine can be determined based on its atomic number. Chlorine has 17 electrons, which can be arranged as follows:
- The first shell can hold 2 electrons.
- The second shell can hold 8 electrons.
- The third shell can hold the remaining 7 electrons.

Thus, the electronic configuration of chlorine is:
\[ 2, 8, 7 \]

### Step 3: Determine the Valence Electrons
From the electronic configuration \(2, 8, 7\), we see that chlorine has 7 valence electrons (the electrons in the outermost shell).

### Step 4: Calculate the Valency
To find the valency, we can use the rule that if the number of valence electrons is more than 4, the valency can be calculated by subtracting the number of valence electrons from 8.

For chlorine:
- Number of valence electrons = 7
- Valency = \(8 - 7 = 1\)

### Conclusion
The valency of chlorine is 1.

---