Multiple Choice
Which of the following ions has ten electrons in its outermost n=2 subshell?
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2. Atoms & Elements
Ions
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Aluminum is a Group 3A metal. Which ion does Al typically form?
A
Al^{+}
B
Al^{3+}
C
Al^{2+}
D
Al^{3-}
Verified step by step guidance1
Identify the group number of aluminum in the periodic table. Aluminum is in Group 3A (or Group 13), which means it has 3 valence electrons.
Recall that metals tend to lose electrons to achieve a stable electron configuration, often resembling the nearest noble gas.
Since aluminum has 3 valence electrons, it typically loses all three to form a cation with a +3 charge.
Write the ion formed by aluminum as \(Al^{3+}\), indicating it has lost three electrons.
Confirm that the other options (\(Al^{+}\), \(Al^{2+}\), \(Al^{3-}\)) do not correspond to the common oxidation state of aluminum in compounds.
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