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Periods

Why do third ...

Question

Why do third period elements expand their coalence above four?

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Solution

The octet rule can expanded by some elements by utilizing $d -$ orbitals found in the $3^{r d}$ principal energy level and beyond. So, atoms like sulphur, phosphorous, chlorine are common examples of elements that form an expanded octet.
For example- $S F_{6}, P C l_{5},$ etc.

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