Question:
In which of the following, the number of unpaired electrons is maximum?
In which of the following, the number of unpaired electrons is maximum?
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Fully filled subshells ($p^{6}$) and noble gas configurations have zero unpaired electrons.
Updated On: Jul 4, 2026
- $P^{3-} (Z=15)$
- $S (Z=16)$
- $Cl (Z=17)$
- $Al^{3+} (Z=13)$
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The Correct Option is B
Solution and Explanation
Step 1: Concept
Determine the number of unpaired electrons using the electronic configuration and Hund's rule.
Step 2: Meaning
Unpaired electrons are found in orbitals that are only partially filled.
Step 3: Analysis
$P^{3-}$ has 18 electrons ($3p^{6}$), all paired. $S$ has 16 electrons ($3p^{4}$), resulting in 2 unpaired electrons. $Cl$ has 17 electrons ($3p^{5}$), resulting in 1 unpaired electron. $Al^{3+}$ has 10 electrons ($2p^{6}$), all paired.
Step 4: Conclusion
Sulfur (S) contains the highest number of unpaired electrons (2) among the given choices. Final Answer: (B)
Determine the number of unpaired electrons using the electronic configuration and Hund's rule.
Step 2: Meaning
Unpaired electrons are found in orbitals that are only partially filled.
Step 3: Analysis
$P^{3-}$ has 18 electrons ($3p^{6}$), all paired. $S$ has 16 electrons ($3p^{4}$), resulting in 2 unpaired electrons. $Cl$ has 17 electrons ($3p^{5}$), resulting in 1 unpaired electron. $Al^{3+}$ has 10 electrons ($2p^{6}$), all paired.
Step 4: Conclusion
Sulfur (S) contains the highest number of unpaired electrons (2) among the given choices. Final Answer: (B)
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