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Non-metals with a d-subshell are able to have expanded octets. For instance, elements 13-17 can have expanded octets. You’ll know to draw an expanded octet when the central atom is bonded to more than 4 elements. The elements that are metals (transition metals included) will tend to give away electrons, and therefore won’t have expanded octets. Xenon can hold 14 electrons because it has an f subshell, which contains 7 orbitals, each capable of holding 2 electrons.
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