Multiple Choice
How many valence electrons does a neutral magnesium atom have?
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9. Electrons in Atoms and the Periodic Table
Valence Electrons of Elements (Simplified)
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How many valence electrons does a bromine (Br) atom have?
A
7
B
2
C
1
D
8
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 by looking at its electron configuration or periodic table position.
Conclude that the number of valence electrons in a bromine atom is 7.
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