Which element has the same number of valence electrons as bromine (Br)?
(1 point)
O potassium (K)
O krypton (Kr)
O chlorine (CI)
• selenium (Se)
Chlorine (CI) has the same number of valence electrons as bromine (Br).
The element that has the same number of valence electrons as bromine (Br) is chlorine (Cl).
To determine which element has the same number of valence electrons as bromine (Br), we need to first look at the periodic table.
Valence electrons are the electrons in the outermost energy level of an atom. For main group elements (also known as representative elements), the number of valence electrons can be determined by looking at the group number.
Bromine (Br) is in group 17, also known as Group VIIA or Group 7. Elements in this group have 7 valence electrons.
Now, let's analyze the options provided:
- Oxygen (O) is in Group 16, also known as Group VIA or Group 6, so it has 6 valence electrons. Therefore, it does not have the same number of valence electrons as bromine.
- Potassium (K) is in Group 1, also known as Group IA or Group 1, so it has 1 valence electron. Therefore, it does not have the same number of valence electrons as bromine.
- Krypton (Kr) is in Group 18, also known as Group VIIIA or Group 8, so it has 8 valence electrons. Therefore, it does not have the same number of valence electrons as bromine.
- Chlorine (Cl) is in Group 17, also known as Group VIIA or Group 7. Since it is in the same group as bromine, it also has 7 valence electrons. Therefore, chlorine has the same number of valence electrons as bromine.
- Selenium (Se) is in Group 16, also known as Group VIA or Group 6, so it has 6 valence electrons. Therefore, it does not have the same number of valence electrons as bromine.
So, the correct answer is chlorine (Cl).