[Grammar] Modifier - which

[divineacclivity]

Right: This model explains all known subatomic particles, some of which were only recently discovered.
Right: This model explains all known subatomic particles, some of them only recently discovered.
Wrong: This model explains all known subatomic particles, of which some were only recently discovered.

The book (Manhattan) says the third one in the above sentences is incorrect without really explaining why for a change.

Why is the usage of "which" in the third sentence above not correct?

Thank you!

 

[5jj]

The third sentence is not wrong, though it does have rather a stuffy ring.

 

[divineacclivity]

The third sentence is not wrong, though it does have rather a stuffy ring.

---------------------------------------------------------------
Thank you but stuffy ring as in?
So, "of which some" is not a wrong usage though might not be the best available, right?

 

[bhaisahab]

---------------------------------------------------------------
Thank you but stuffy ring as in?
So, "of which some" is not a wrong usage though might not be the best available, right?

It's not wrong but it is rather formal.