Which element has the same number of valence electrons as bromine (Br)?
(1 point)
O krypton (Kr)
selenium (Se)
O potassium (K)
chlorine (CI)
chlorine (CI)
Chlorine (Cl) has the same number of valence electrons as bromine (Br). Both chlorine and bromine belong to Group 17 (or Group 7A) of the periodic table, also known as the halogens. They each have seven valence electrons. Therefore, the correct answer is chlorine (Cl).
To determine which element has the same number of valence electrons as bromine (Br), we first need to determine the number of valence electrons in bromine. The valence electrons are the electrons in the outermost shell of an atom, which are involved in chemical bonding.
Bromine is in Group 17 (also known as Group VIIA or the halogens) of the periodic table. Group 17 elements have 7 valence electrons because they have 7 electrons in their outermost shell.
Now let's analyze the options:
- Oxygen (O) is in Group 16 and has 6 valence electrons. Therefore, it does not have the same number of valence electrons as bromine.
- Krypton (Kr) is in Group 18 (noble gases), and noble gases have full valence electron shells. Krypton has 8 valence electrons, so it does not have the same number of valence electrons as bromine.
- Selenium (Se) is in Group 16 and also has 6 valence electrons. Therefore, it does not have the same number of valence electrons as bromine.
- Potassium (K) is in Group 1 and has 1 valence electron. It does not have the same number of valence electrons as bromine.
- Chlorine (Cl) is in Group 17, just like bromine, and also has 7 valence electrons. Therefore, chlorine has the same number of valence electrons as bromine.
Therefore, the element that has the same number of valence electrons as bromine (Br) is "chlorine (Cl)."