Multiple Choice
According to Valence Shell Electron Pair Repulsion (VSEPR) Theory, how many electron groups are around the central carbon atom in carbon dioxide (CO_2)?
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12. Molecular Shapes & Valence Bond Theory
Valence Shell Electron Pair Repulsion Theory
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According to Valence Shell Electron Pair Repulsion (VSEPR) Theory, how many electron groups are around the central nitrogen atom in an ammonia (NH3) molecule?
A
5
B
2
C
4
D
3
Verified step by step guidance1
Identify the central atom in the ammonia (NH\_3) molecule, which is nitrogen (N).
Determine the number of valence electrons around the nitrogen atom. Nitrogen has 5 valence electrons.
Count the number of atoms bonded to the nitrogen. In NH\_3, nitrogen is bonded to 3 hydrogen atoms.
Consider the lone pairs of electrons on the nitrogen atom. Since nitrogen has 5 valence electrons and forms 3 bonds, it has 1 lone pair of electrons.
Add the number of bonded atoms and lone pairs to find the total number of electron groups around nitrogen: 3 (bonded atoms) + 1 (lone pair) = 4 electron groups.
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