Chlorine is more reactive than _____ [fluorine/iodine]

Explanation

To determine which element chlorine is more reactive than, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Group**: Chlorine is a non-metal that belongs to Group 17 of the periodic table, also known as the halogens. The elements in this group include fluorine (F), chlorine (Cl), bromine (Br), and iodine (I).

2. **Understand Reactivity Trends**: In non-metals, the reactivity generally decreases as you move down a group in the periodic table. This is because the tendency of an atom to gain electrons decreases as you go down the group.

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