Multiple Choice
How many valence electrons does helium (He) have?
2
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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
Verified step by step guidance1
Identify the position of bromine (Br) on the periodic table. Bromine is in Group 17 (also called Group VIIA), which is the halogen group.
Recall that the group number for main-group elements corresponds to the number of valence electrons. 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 has 7 valence electrons because it needs one more electron to complete its octet, which is typical for halogens.
Therefore, the number of valence electrons in a bromine atom is 7.
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