Multiple Choice
Which group on the periodic table is considered the least reactive?
2. Atoms & Elements
Periodic Table: Group Names
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Which group on the periodic table is considered the least reactive?
A
Group 1 (Alkali metals)
B
Group 17 (Halogens)
C
Group 2 (Alkaline earth metals)
D
Group 18 (Noble gases)
Verified step by step guidance1
Understand that reactivity in the periodic table generally depends on how easily an element can gain, lose, or share electrons to achieve a stable electron configuration.
Recall that Group 1 (Alkali metals) are highly reactive because they have one electron in their outer shell that they readily lose to form positive ions.
Recognize that Group 17 (Halogens) are also very reactive because they have seven electrons in their outer shell and tend to gain one electron to complete their octet.
Note that Group 2 (Alkaline earth metals) are reactive but less so than Group 1, as they have two electrons to lose to achieve stability.
Identify that Group 18 (Noble gases) have a full outer electron shell, making them very stable and thus the least reactive group on the periodic table.
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