Multiple Choice
Which group of elements on the periodic table is the least reactive?
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2. Atoms & Elements
Periodic Table: Group Names
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Which halogen element has 5 energy levels in its atoms?
A
Chlorine (Cl)
B
Bromine (Br)
C
Iodine (I)
D
Fluorine (F)
Verified step by step guidance1
Recall that the number of energy levels (or electron shells) in an atom corresponds to the period (row) of the element in the periodic table.
Identify the group of halogens in the periodic table; halogens are in Group 17.
Determine the period number for each halogen option: Fluorine (F) is in period 2, Chlorine (Cl) is in period 3, Bromine (Br) is in period 4, and Iodine (I) is in period 5.
Since the number of energy levels equals the period number, Bromine (Br) has 4 energy levels, and Iodine (I) has 5 energy levels.
Therefore, the halogen element with 5 energy levels in its atoms is Iodine (I).
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