MCQ
In the electronic structure of $H_2SO_4$, the total number of unshared electrons is
- A$20$
- ✓$16$
- C$12$
- D$8$
✓
Answer
Correct option: B.
$16$
b
Shared pairs of electrons are electrons that are used in covalent bonding. Unshared pairs of electrons are electrons that remain in the outer shell of the atom that isn't used in a covalent
Shared pairs of electrons are electrons that are used in covalent bonding. Unshared pairs of electrons are electrons that remain in the outer shell of the atom that isn't used in a covalent
bond.
In the molecule $\mathrm{H}_{2} \mathrm{SO}_{4}$
Electronic configuration of Oxygen is $1 s^{2} 2 s^{2} 2 p^{4}$
sulphur is $1 \mathrm{s}^{2} 2 \mathrm{s}^{2} 2 \mathrm{p}^{6} 3 \mathrm{s}^{2} 3 \mathrm{p}^{4}$
hydrogen is $1 \mathrm{s}^{1}$
Total no. of outermost electrons $=6 \times 4+6 \times 1+1 \times 2=32$
no. of shared electrons $=2 \times$ no. of covalent bonds $=2 \times 8=16$
No. of unshared $\mathrm{e}^{-} \mathrm{s}=32-16=16$
Hence, the correct option is $\mathrm{B}$
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