Multiple Choice
Which of the following best describes the Lewis dot structure for a neutral potassium atom (K)?
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11. Bonding & Molecular Structure
Lewis Dot Structures: Neutral Compounds
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Which of the following statements correctly describes the Lewis dot structure of CF3CH2F (1,1,1,2-tetrafluoroethane)?
A
Each carbon atom forms four single bonds, and all fluorine atoms are bonded to carbon atoms.
B
The molecule contains a double bond between the two carbon atoms.
C
There is a lone pair of electrons on each carbon atom.
D
One of the fluorine atoms is bonded directly to a hydrogen atom.
Verified step by step guidance1
Identify the molecular formula and structure of CF3CH2F (1,1,1,2-tetrafluoroethane). It consists of two carbon atoms connected by a single bond, with fluorine and hydrogen atoms attached to the carbons.
Recall that carbon atoms typically form four covalent bonds to satisfy the octet rule, and fluorine atoms form one single bond with a full octet of electrons (including three lone pairs).
Draw the Lewis structure by first connecting the two carbon atoms with a single bond, then attach three fluorine atoms to the first carbon (CF3 group), two hydrogens and one fluorine to the second carbon (CH2F group).
Verify that each carbon has four single bonds (either to carbon, fluorine, or hydrogen), and that all fluorine atoms are bonded directly to carbon atoms, not to hydrogen or other atoms.
Confirm that there are no double bonds between the carbon atoms, no lone pairs on carbon atoms (since carbon uses all four valence electrons in bonding), and no fluorine atoms bonded to hydrogen atoms.
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