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I don't think there is a general rule as to whether you should add lone pairs or double bonds between atoms to the central atom to achieve a stable octet of electrons. It just depends on the molecule itself and what would make a structure with the lowest formal charge possible for the lewis structure of the molecule.
I agree with Heung. There is no particular rule to follow if double bonds are prioritized over lone pairs. It's a matter of minimizing the formal charge, but also taking into consideration the capabilities (bond-wise) of a given atom.
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