Respuesta :
Bromine (Br) known to be part of halogens have 7 valance electrons. To identify how many valence electron using the group number, you can find VII. It is a roman numeral of seven. It means that elements belong to VIIA have 7 electron, same with potassium (K) has 1 valence electron so that's why it belongs to 1A. The valence electron of Br are found in 4s and 4p.
Br (bromine) belongs to VIIA group, and bromine has seven valence electrons in it.
What are valence electrons?
Valence electrons are those electrons which are present on the outer most shell of any atom.
As it is given that bromine belongs from the VIIA group of the periodic table and in the bromine atom 7 valence electrons are present and all atoms of this group will have same number of valence electrons. Electronic configuration of bromine is [Ar]4s²3d¹⁰4p⁵.
Hence in bromine group 7 valence electrons are present.
To know more about valence electrons, visit the below link:
https://brainly.com/question/13552988
