The hybridization of an atom depends on the number of groups attached on it.
We consider single bonds and lone pairs as groups attached to the central element. Multiple bonds are counted as a single group.
Selenium (EN = 2.55) is less electronegative than chlorine (EN = 3.16) so Se goes in the center of the Lewis structure. Since Se belongs to Period 4, we can use an expanded octet to accommodate more Cl atoms in the molecule.
The Lewis structure for SeCl6 is:
Give the expected hybridization of the central atom for the molecule.
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