An element M combines with a halogen Cl. What would be the formula of the compound obtained if M has a valence of 2 ?

Explanation

To determine the formula of the compound formed when element M combines with chlorine (Cl), we need to follow these steps:

### Step 1: Identify the Valency of the Elements
- The problem states that element M has a valence of 2.
- Chlorine (Cl) is a halogen and typically has a valency of 1 because it has 7 valence electrons and needs 1 more to complete its octet.

### Step 2: Write Down the Valencies
- Valency of M = 2
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