An element belongs to group 17 and period 3 of the periodic table. Write the following:
Its electronic configuration.

Explanation

To find the electronic configuration of an element that belongs to group 17 and period 3 of the periodic table, we can follow these steps:

### Step 1: Identify the Element
- Since the element is in group 17, it is a halogen. The halogens in period 3 include chlorine (Cl).

### Step 2: Determine the Period
- The element is in period 3, which means it has three electron shells.

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