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Which of the following correctly states the number of valence electrons in H2S and provides the correct Lewis structure for the molecule?
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10. Periodic Properties of the Elements
Valence Electrons of Elements
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How many valence electrons does a bromine (Br) atom have?
A
8
B
6
C
5
D
7
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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 the group number for main-group elements corresponds to the number of valence electrons for that element. For Group 17 elements, the number of valence electrons is 7.
Understand that valence electrons are the electrons in the outermost shell of an atom that participate in chemical bonding.
Confirm that bromine, being in Group 17, has 7 valence electrons because it needs one more electron to complete its octet.
Therefore, the number of valence electrons in a bromine atom is 7.
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