Chemistry Practice Problems Octet Rule Practice Problems Solution: Which elements should never have expanded octets?

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Solution: Which elements should never have expanded octets?

Problem

Which elements should never have expanded octets?

Solution

We’re being asked to determine which elements should never have expanded octet. 


Recall that the octet rule states that an element is surrounded by eight electrons in the Lewis structure. 


Exceptions to this rule occur when:

• there is an odd number of electrons, like in radicals

• there are less than 8 electrons or incomplete octet

• there are more than 8 electrons or expanded octet. This occurs to nonmetals from Period 3 to 7.


For this problem, we are asked for those elements that should never have expanded octet

Recall that valence electrons are outer shell electrons with an atom and can participate in the formation of chemical bonds.

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