Question:
In which of the following, the number of valence electrons is maximum?
In which of the following, the number of valence electrons is maximum?
Show Hint
Total valence electrons are calculated as:
\[
\boxed{\text{Sum of valence electrons of all atoms } \pm \text{ionic charge}}
\]
(Add electrons for negative charge and subtract for positive charge.)
Updated On: Jul 9, 2026
- \(\mathrm{PO_4^{3-}}\)
- \(\mathrm{SO_3^{2-}}\)
- \(\mathrm{CO_3^{2-}}\)
- \(\mathrm{CNO^-}\) \bigskip
Show Solution
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The Correct Option is A
Solution and Explanation
Step 1: Calculate the total valence electrons.
\[
\begin{aligned}
\mathrm{PO_4^{3-}} &: 5+4(6)+3=32[2mm]
\mathrm{SO_3^{2-}} &: 6+3(6)+2=26[2mm]
\mathrm{CO_3^{2-}} &: 4+3(6)+2=24[2mm]
\mathrm{CNO^-} &: 4+5+6+1=16
\end{aligned}
\]
Step 2: Compare the values. \[ 32>26>24>16 \] Therefore, \(\mathrm{PO_4^{3-}}\) has the maximum number of valence electrons.
Step 3: Final conclusion. \[ \boxed{\mathrm{PO_4^{3-}}} \] Hence, the correct option is \(\boxed{(A)}\).
Step 2: Compare the values. \[ 32>26>24>16 \] Therefore, \(\mathrm{PO_4^{3-}}\) has the maximum number of valence electrons.
Step 3: Final conclusion. \[ \boxed{\mathrm{PO_4^{3-}}} \] Hence, the correct option is \(\boxed{(A)}\).
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