Which element has the same number of valence electrons as bromine (Br)?
(1 point)
a potassium (K)
b krypton (Kr)
c chlorine (CI)
d selenium (Se)
c chlorine (CI)
The element that has the same number of valence electrons as bromine (Br) is chlorine (CI). Therefore, the correct answer is option c: chlorine (CI).
To determine which element has the same number of valence electrons as bromine (Br), we need to look at the periodic table.
Valence electrons are the electrons in the outermost energy level (also known as the valence shell) of an atom. To find the number of valence electrons for an element, you can check its group number on the periodic table.
Bromine (Br) is in group 17 (also known as Group VIIA or Group 7) of the periodic table. Elements in this group have 7 valence electrons.
Now let's consider the answer choices:
a) Potassium (K) is in group 1, so it has 1 valence electron. Therefore, it does not have the same number of valence electrons as bromine.
b) Krypton (Kr) is in group 18 (also known as the noble gases) and has 8 valence electrons. Therefore, it does not have the same number of valence electrons as bromine.
c) Chlorine (Cl) is in the same group (Group 17) as bromine and it also has 7 valence electrons. Therefore, chlorine has the same number of valence electrons as bromine.
d) Selenium (Se) is in group 16 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:
c) Chlorine (Cl)