Wetenschap
The halogens are a group on the periodic table (Group 17 or VIIa) which includes:
* Fluorine (F): Atomic number 9
* Chlorine (Cl): Atomic number 17
* Bromine (Br): Atomic number 35
* Iodine (I): Atomic number 53
* Astatine (At): Atomic number 85
Each halogen has a unique atomic number, which represents the number of protons in its nucleus.
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