객관식
Which of the following best describes the Lewis dot structure for OF_2 (oxygen difluoride)?
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11. Bonding & Molecular Structure
Lewis Dot Structures: Neutral Compounds
객관식
Which of the following best describes the correct Lewis dot structure for the neutral compound CH2?
A
Carbon is bonded to two hydrogen atoms and has two lone pairs.
B
Carbon is bonded to two hydrogen atoms and has a complete octet with four bonds.
C
Carbon is bonded to two hydrogen atoms and has two unpaired electrons.
D
Carbon is bonded to two hydrogen atoms and has one lone pair.
검증된 단계별 안내1
Step 1: Determine the total number of valence electrons available for the molecule CH2. Carbon has 4 valence electrons, and each hydrogen has 1 valence electron, so total valence electrons = 4 + 2(1) = 6 electrons.
Step 2: Recognize that carbon typically forms four bonds to complete its octet, while hydrogen forms only one bond to fill its duet (2 electrons).
Step 3: Since there are only 6 valence electrons total, it is impossible for carbon to form four bonds (which would require 8 electrons) or to have two lone pairs (which would require 4 electrons as lone pairs plus bonding electrons).
Step 4: Consider that carbon can form two single bonds with the two hydrogens, using 4 electrons, and the remaining 2 electrons will be unpaired on carbon, resulting in two unpaired electrons rather than lone pairs.
Step 5: Conclude that the correct Lewis structure for CH2 is carbon bonded to two hydrogen atoms with two unpaired electrons on carbon, reflecting the molecule's radical nature and incomplete octet.
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