Multiple Choice
Which of the following elements is least likely to undergo a chemical reaction?
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Periodic Table: Group Names
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Which period and group does the element bromine (Br) belong to on the periodic table?
A
Period 3, Group 16
B
Period 4, Group 17
C
Period 2, Group 15
D
Period 5, Group 7
Verified step by step guidance1
Recall that the periodic table is organized into periods (horizontal rows) and groups (vertical columns). Each element's position corresponds to its electron configuration and chemical properties.
Identify the atomic number of bromine (Br), which is 35. This helps determine its position in the periodic table.
Determine the period by counting the number of electron shells occupied by bromine. The period number corresponds to the highest principal quantum number (n) of bromine's electrons.
Determine the group by looking at bromine's valence electrons. Bromine is a halogen, which means it has 7 valence electrons, placing it in Group 17.
Combine the period and group information: bromine is in Period 4 (four electron shells) and Group 17 (halogens with 7 valence electrons).
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