Multiple Choice
Which of the following best describes the Lewis dot structure of neutral NBr (nitrogen monobromide)?
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11. Bonding & Molecular Structure
Lewis Dot Structures: Neutral Compounds
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Which of the following best describes the Lewis dot structure of a neutral CH4 molecule?
A
Carbon atom in the center with one triple bond to one hydrogen atom and three single bonds to three hydrogen atoms.
B
Carbon atom in the center with four lone pairs and no bonds to hydrogen atoms.
C
Carbon atom in the center with four single bonds to four hydrogen atoms; no lone pairs on carbon.
D
Carbon atom in the center with two double bonds to two hydrogen atoms; two lone pairs on carbon.
Verified step by step guidance1
Recall that a Lewis dot structure represents the valence electrons of atoms in a molecule, showing bonds as pairs of shared electrons and lone pairs as unshared electron pairs.
Determine the total number of valence electrons in CH4: Carbon has 4 valence electrons, and each Hydrogen has 1 valence electron, so total electrons = 4 + (4 × 1) = 8 electrons.
Recognize that carbon typically forms four covalent bonds to complete its octet, and hydrogen forms one bond to achieve a duet (2 electrons).
Construct the Lewis structure by placing carbon in the center and forming four single bonds to four hydrogen atoms, using all 8 valence electrons in bonding pairs.
Confirm that carbon has no lone pairs and each hydrogen has a full valence shell, making the structure stable and neutral.
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