Multiple Choice
How many valence electrons does strontium (Sr) have?
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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
7
B
6
C
8
D
5
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 responsible for chemical bonding and reactivity.
Confirm that bromine's electron configuration ends in 4p5, indicating 5 electrons in the p subshell plus 2 electrons in the 4s subshell, totaling 7 valence electrons.
Conclude that bromine has 7 valence electrons based on its position in the periodic table and its electron configuration.
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