We’re being asked to determine which of the given anions contains a central atom that does not follow the octet rule (i.e. an 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.
Which, if any, of these anions has an expanded octet around its central atom?
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What scientific concept do you need to know in order to solve this problem?
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