Multiple Choice
For the neutral atoms of nitrogen (N), oxygen (O), and fluorine (F), which of the following lists the correct number of dots in their Lewis electron-dot structures, respectively?
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11. Bonding & Molecular Structure
Lewis Dot Structures: Neutral Compounds
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In the Lewis dot structure of the neutral compound CS_2, how many regions of high electron density (RHEDs) surround the central carbon atom?
A
3
B
2
C
1
D
4
Verified step by step guidance1
Identify the central atom in the molecule CS_2, which is carbon (C).
Determine the total number of valence electrons for the central atom and the surrounding atoms. Carbon has 4 valence electrons, and each sulfur has 6 valence electrons.
Draw the Lewis structure by connecting the carbon atom to each sulfur atom with bonds. Since CS_2 is a neutral molecule, distribute the electrons to satisfy the octet rule for each atom.
Count the regions of high electron density (RHEDs) around the central carbon atom. RHEDs include single bonds, double bonds, triple bonds, and lone pairs on the central atom.
Since carbon forms two double bonds with the two sulfur atoms and has no lone pairs, the number of RHEDs around carbon is equal to the number of bonds it forms, which is 2.
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