Which element has the same number of valence electrons as bromine (br)?
Krypton (kr)
Potassium (k)
chlorine (cl)
selenium
(se)
The element that has the same number of valence electrons as bromine (Br) is chlorine (Cl).
To find the element with the same number of valence electrons as bromine (Br), we need to look at the periodic table. Valence electrons are the electrons present in the outermost shell of an atom.
Bromine (Br) is located in group 17 or Group VIIA of the periodic table. Elements in this group are known as halogens and have 7 valence electrons.
Now let's look at the given elements:
Krypton (Kr) is located in group 18 or Group 0 of the periodic table. It is a noble gas and has 8 valence electrons. Therefore, it does not have the same number of valence electrons as bromine.
Potassium (K) is located in group 1 or Group IA of the periodic table. It is an alkali metal and has 1 valence electron. Therefore, it does not have the same number of valence electrons as bromine.
Chlorine (Cl) is located in group 17 or Group VIIA of the periodic table, just like bromine. It is a halogen and has 7 valence electrons. Therefore, chlorine has the same number of valence electrons as bromine.
Selenium (Se) is located in group 16 or Group VIA of the periodic table. It is a chalcogen and has 6 valence electrons. Therefore, it does not have the same number of valence electrons as bromine.
So, the element that has the same number of valence electrons as bromine (Br) is chlorine (Cl).