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Given the following orbital diagram: 1s^2 2s^2 2p^5, which element does this represent, and how many valence electrons does it 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
8
B
7
C
6
D
5
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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 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 that participate in chemical bonding.
Confirm that bromine's electron configuration ends in 4s2 3d10 4p5, where the 4s and 4p orbitals contain the valence electrons.
Count the electrons in the outermost shell (4s2 and 4p5), which sum to 7 valence electrons for bromine.
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