Multiple Choice
Which group of elements on the periodic table contains elements with two electron shells?
1
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2. Atoms & Elements
Periodic Table: Group Names
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Which group of elements on the periodic table is considered the least reactive?
A
Noble gases
B
Halogens
C
Alkali metals
D
Transition metals
Verified step by step guidance1
Understand that reactivity in elements depends on their electron configuration, particularly the stability of their outermost electron shell.
Recall that alkali metals (Group 1) are highly reactive because they have one electron in their outer shell that they readily lose to form positive ions.
Recognize that halogens (Group 17) are also very reactive because they have seven electrons in their outer shell and tend to gain one electron to achieve a full shell.
Know that transition metals (Groups 3-12) have moderate reactivity due to their variable oxidation states and partially filled d orbitals.
Identify that noble gases (Group 18) are the least reactive because they have a full outer electron shell, making them very stable and unlikely to participate in chemical reactions.
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