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Cs2 and Co3 2 obey the octet rule. the others don't
No. The boron atom is electron deficient. It only has 6 outer shell electrons in this molecule.
No, it is the extension of octet rule due to involvement of 'd' orbitals of Phosphorus.
Yes, SO4 2- can be drawn without violating the octet rule. It is also a resonance structure. Here's