Multiple Choice
Metalloids can sometimes adopt the bonding preferences of similar nonmetals. Based on your knowledge of expanded octets, draw the Lewis Dot Structure for the following ion, SiF62–.
4. Molecular Compounds
Lewis Dot Structures: Exceptions (Simplified)
Multiple Choice
Draw the Lewis Dot Structure for POCl3.
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B
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D
Verified step by step guidance1
Identify the total number of valence electrons in POCl3. Phosphorus (P) has 5 valence electrons, oxygen (O) has 6, and each chlorine (Cl) has 7. Therefore, the total is 5 + 6 + (3 * 7) = 32 valence electrons.
Determine the central atom. Phosphorus (P) is less electronegative than oxygen and chlorine, so it will be the central atom.
Connect the central phosphorus atom to the oxygen and three chlorine atoms using single bonds. This uses up 8 electrons (4 bonds * 2 electrons per bond).
Distribute the remaining 24 electrons to satisfy the octet rule for the outer atoms (oxygen and chlorine). Start by placing 6 electrons (3 pairs) around each chlorine atom and 4 electrons (2 pairs) around the oxygen atom.
Check if the central phosphorus atom has a complete octet. If not, consider forming a double bond between phosphorus and oxygen to satisfy the octet rule for phosphorus, while ensuring the total number of electrons used is 32.
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