Multiple Choice
In the periodic table, which group of elements is generally the most reactive metals?
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4. Atoms and Elements
Periodic Table: Group Names
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In the periodic table, Group 7 (the halogens) becomes less reactive down the group. Which element is least reactive in Group 7?
A
Fluorine (F)
B
Chlorine (Cl)
C
Bromine (Br)
D
Iodine (I)
Verified step by step guidance1
Understand that Group 7 elements in the periodic table are called halogens, which include Fluorine (F), Chlorine (Cl), Bromine (Br), Iodine (I), and Astatine (At).
Recall the trend in reactivity for halogens: reactivity decreases as you move down the group because the atoms get larger and it becomes harder for them to gain an electron due to increased distance and shielding effect.
Identify the order of halogens from top to bottom: Fluorine (F) is at the top, followed by Chlorine (Cl), Bromine (Br), and then Iodine (I).
Since reactivity decreases down the group, the element at the bottom of the list (Iodine) is the least reactive among the options given.
Therefore, by applying the trend of decreasing reactivity down Group 7, conclude that Iodine (I) is the least reactive element among Fluorine, Chlorine, Bromine, and Iodine.
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