Why are the elements of group 17 called halogens?

Explanation

**Step-by-Step Solution:**

1. **Identify the Group:** The elements in question belong to Group 17 of the periodic table. This group includes fluorine (F), chlorine (Cl), bromine (Br), iodine (I), and astatine (At).

2. **Understanding the Term "Halogen":** The term "halogen" is derived from Greek roots: "halo" meaning salt and "genes" meaning to produce or generate. Therefore, halogens are known as "salt-formers."

3. **Reactivity with Metals:** Halogens are highly reactive nonmetals. When they react with metals, they form ionic compounds known as salts. For example, when sodium (Na), a metal, reacts with chlorine (Cl), a halogen, they form sodium chloride (NaCl), which is common table salt.

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