Multiple Choice
Which of the following would be a negative ion with a single charge?
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2. Atoms & Elements
Ions
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Which of the following ions does NOT have a noble gas electron configuration in its ground state?
A
Fe^{2+}
B
Na^+
C
Cl^-
D
O^{2-}
Verified step by step guidance1
Recall that a noble gas electron configuration means the ion has the same electron configuration as a noble gas, which typically means a full outer shell of electrons.
Determine the electron configuration of the neutral atoms involved: Sodium (Na), Chlorine (Cl), Oxygen (O), and Iron (Fe).
For each ion, adjust the number of electrons according to the charge: Na^+ loses one electron, Cl^- gains one electron, O^{2-} gains two electrons, and Fe^{2+} loses two electrons.
Compare the resulting electron configurations of each ion to the nearest noble gas configuration to see if they match exactly.
Identify which ion does NOT match a noble gas configuration; this will be the ion whose electron configuration does not correspond to a full outer shell like a noble gas.
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