State the number of valence electrons in:
halogens

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Solution

Valence electrons are the electrons present in the outermost shell of an atom.
Number of valence electrons in halogens is 7.
Example of halogens: Group-17 members of the modern periodic table like Fluorine (F), Chlorine (Cl), Bromine (Br), Iodine (I)
Example: Fluorine (F) has 9 electrons distributed as 2, 7.
Chlorine (Cl) has 17 electrons distributed as 2, 8, 7
So the number of valence electrons are 7 for halogens.

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