Matter Interactions Unit Test
3 of 133 of 13 Items
Question
Use the periodic table to answer the question.
An illustration shows the periodic table.
Which element has the same number of valence electrons as bromine (Br)?
(1 point)
Responses
krypton (Kr)
krypton (Kr)
selenium (Se)
selenium (Se)
chlorine (Cl)
chlorine (Cl)
potassium (K)
(1 point)
chlorine (Cl)
To find the element that has the same number of valence electrons as bromine (Br), we need to locate bromine on the periodic table and find an element in the same group.
Bromine (Br) is located in Group 7A on the periodic table. This group is also known as Group 17 or the halogens.
The element in Group 7A that also has the same number of valence electrons as bromine is chlorine (Cl).
So, the correct answer is chlorine (Cl).
To answer this question, we need to know which element has the same number of valence electrons as bromine (Br). Valence electrons are the electrons in the outermost energy level of an atom.
To find the number of valence electrons for bromine (Br), we can refer to the periodic table. Each element is arranged in order of increasing atomic number. The atomic number of an element is equal to the number of protons in its nucleus.
Bromine (Br) is located in Group 17 (also known as Group VIIA or Group 7) of the periodic table. Elements in this group are known as halogens, and they have 7 valence electrons.
Now, we need to find an element with the same number of valence electrons as bromine, which is 7. Let's go through the answer choices:
1. Krypton (Kr) - Krypton is located in Group 18 (also known as Group VIIIA or Group 8) of the periodic table. Elements in this group, known as noble gases, have a full outermost energy level. Krypton has 8 valence electrons, not 7, so it is not the correct answer.
2. Selenium (Se) - Selenium is located in Group 16 (also known as Group VIB or Group 6) of the periodic table. Elements in this group have 6 valence electrons, not 7, so it is not the correct answer.
3. Chlorine (Cl) - Chlorine is located in Group 17 (also known as Group VIIA or Group 7) of the periodic table. Elements in this group, like bromine, have 7 valence electrons. Therefore, chlorine has the same number of valence electrons as bromine, making it the correct answer.
4. Potassium (K) - Potassium is located in Group 1 (also known as Group IA or Group 1) of the periodic table. Elements in this group, known as alkali metals, have 1 valence electron. Potassium does not have the same number of valence electrons as bromine, so it is not the correct answer.
Therefore, the correct answer is chlorine (Cl), as it has the same number of valence electrons as bromine (Br).