Multiple Choice
Which of the following is the best method to determine the number of valence electrons in a neutral atom of a main group element?
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10. Periodic Properties of the Elements
Valence Electrons of Elements
Multiple Choice
How many valence electrons does a bromine (Br) atom have?
A
5
B
8
C
6
D
7
Verified step by step guidance1
Identify the group number of bromine (Br) in the periodic table. Bromine is in Group 17, which is also known as the halogens group.
Recall that elements in Group 17 have 7 valence electrons because the group number corresponds to the number of valence electrons for main-group elements.
Understand that valence electrons are the electrons in the outermost shell of an atom and are important for chemical bonding.
Confirm that bromine, being in Group 17, has 7 valence electrons, which explains its chemical reactivity and tendency to gain one electron to complete its octet.
Therefore, the number of valence electrons in a bromine atom is 7.
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