Multiple Choice
In a formula unit of MnO, the total oxide ion charge is 2–. What is the charge on each manganese ion?
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2. Atoms & Elements
Ions
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For most atoms, how many electrons are needed in the outermost shell to achieve a stable (noble gas) electron configuration?
A
8
B
10
C
6
D
2
Verified step by step guidance1
Understand that atoms achieve stability by having a full outermost electron shell, which corresponds to the electron configuration of the nearest noble gas.
Recall the octet rule, which states that most atoms are stable when they have 8 electrons in their valence (outermost) shell.
Recognize that this rule applies primarily to main-group elements, where having 8 valence electrons leads to a noble gas configuration.
Note exceptions such as hydrogen and helium, which are stable with 2 electrons in their outer shell (duet rule), but for most atoms, 8 electrons are needed.
Therefore, the number of electrons needed in the outermost shell to achieve a stable noble gas configuration is 8.
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