Which of these compounds contain elements that do not follow the octet rule? explain. **?

Hydrogen and helium doesn't follow octet rule as they follow doublet rule to attain stability. 

Some compounds like BF3 doesn't follow octet rule even the valence shell is D Orbital. Because boron shares the 3 electron with 3 flourine atoms to make stable even with 6 pairs of electron. but they always attempt to gain 4 pair of electrons resulting in BF4- sometimes. but they are negatively charged.

The kinetic energy of the liquid increases. hope this !

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